A typical scenario (an illustrative story based on common situations, not a review from a specific customer)

The night twelve cats went upstairs

Nan runs a grooming salon and small pet hotel in a two-unit shophouse in Bueng Kum, eastern Bangkok. The ground floor holds a reception counter, a wet room with two stainless-steel bathing tubs, a grooming table, a cabinet dryer, shelves of shampoo and stacks of towels. Behind it are six glass-fronted dog suites. Upstairs are twelve plywood cat condos lined with carpet, plus a storeroom for kibble and litter. Most of her regulars live in the housing estates nearby and board their pets when they travel upcountry or work long shifts.

On the night of 25 September 2026, the second day of non-stop rain, water began to slide under the roller shutter at around 10 p.m. Nan and two staff members drove the boarding dogs back to any owner who could still be reached; the rest were carried upstairs to share space with the cats. By 2 a.m. the water inside was knee-deep. The cabinet dryer, the washing machine and every sack of dog food on the floor went under. The ground floor stayed flooded for days before the water dropped low enough to walk through comfortably.

When it finally receded, the first thing Nan noticed was the smell: mud mixed with drain water, fermenting kibble and a heavy mustiness that had crept all the way up the stairs. Small black spots had appeared along the edges of the plywood shelves. Rat droppings were mixed into the silt under the bathing tubs. The carpet on the lowest cat condo had a white bloom. And while she shovelled mud, her phone kept buzzing. Owners wanted to know when she would reopen, because they had to get back to work. One message stopped her: "How do you disinfect the shop? My dog only just recovered from a skin infection and I'm scared he'll catch it again."

That question is the subject of this article: which germs floods bring into grooming salons and pet hotels, why the usual clean-up leaves gaps, and where ozone disinfection of empty rooms fits in as the final step of recovery.

The late-September 2026 Bangkok floods and the pet-care trade

According to news reports, Bangkok received roughly 300 mm of rain in about 48 hours between 24 and 27 September 2026. On 26 September the Bangkok Metropolitan Administration declared all 50 districts a disaster zone. Eastern Bangkok was hit hardest, with Khlong Chan and Bueng Kum among the areas mentioned. Governor Chadchart Sittipunt said the canals were full and that drainage would take two to three days after the rain stopped. Reports also noted three deaths; our thoughts are with their families.

As of 30 September, some roads, including Si Burapha and Lat Phrao, still had 20 to 40 cm of standing water. Thai media compared the event with the great flood of 2011, and one Thai business report cited a Chamber of Commerce estimate of about 12,300 million baht in damage.

Most pet-care businesses in Bangkok are small to mid-sized operations in shophouses, row units, condo ground floors and community malls. Those locations are convenient for customers, but they are also the first places water reaches. And unlike an ordinary shop, a grooming salon or pet hotel is full of surfaces that animals lick, sleep on, scratch and breathe right next to. That is why the bar for recovery has to be higher.

What germs floodwater carries into a pet shop

Urban floodwater is not clean rainwater. It runs across roads, through storm drains, septic tanks, rubbish bins and the places where rats live. When that water sits inside a shop for days, the silt it leaves and the moisture it pushes into materials contain bacteria, viruses, mold spores and plenty of organic matter for microbes to feed on.

Leptospira: the rat-urine germ that infects people and dogs

Leptospirosis is the disease health authorities warn about after every flood. The bacteria are shed in the urine of rats and some other animals, survive for a time in standing water and wet soil, and enter the body through cuts, scratches or the mucous membranes of the eyes, nose and mouth. Many owners do not realise that dogs catch it too, by wading through water, drinking from puddles or licking contaminated floors. Groomers, who often have small nicks from scissors and claws, need to be especially careful while shovelling mud and washing down the shop.

Sewage bacteria in tubs, drains and gutters

Bathing tubs drain into the floor. When floodwater rises, sewage from the public system can push back up through those same pipes. Sludge trapped under the tubs, in pipe joints and in the drainage channels in front of dog runs becomes a reservoir for faecal bacteria, which cause diarrhoea in both people and animals. These are usually the hardest corners to scrub and the slowest to dry.

Ringworm fungi and mold on fabric, wood and carpet

Ringworm is a familiar headache for any pet business. The fungi responsible thrive in damp, stuffy conditions and spread through brushes, combs, towels and cage floors, and they can pass from animals to people. After a flood, humidity indoors stays high for days. Damp towels, pet beds, carpeted cat trees and plywood shelving become home to a range of fungi, from the ones that cause skin disease to the black and green molds that release spores into the air. WHO and CDC guidance is to clean and dry within 24 to 48 hours to limit mold growth, but a shop that sat underwater for days has usually missed that window.

Animal viruses that persist in the environment

Some animal viruses, such as canine parvovirus, are well known among vets for surviving a long time in the environment. Respiratory infections common in boarding settings also spread easily when many animals share poorly ventilated air. After a flood, shops are often shut tight with the air conditioning off, and the air in the boarding rooms sits still for days. That is not the condition you want when the first guest walks back in.

Who is most at risk

• Puppies and kittens whose immunity is still developing or whose vaccinations are incomplete.
• Senior pets and those with chronic illness, such as kidney or heart disease or long-term skin conditions.
• Pets that have just recovered from skin infections, which can relapse in damp surroundings.
• Groomers, who often have small cuts on their hands and handle water and fur all day.
• Owners who are elderly, young children, pregnant women and people with chronic conditions, who take the pet home and cuddle it on the sofa or in bed.

Important: if you or your staff develop a fever, headache, muscle pain (especially in the calves), red eyes or diarrhoea after wading through floodwater or cleaning the shop, see a doctor and mention the flood exposure. Animals that are lethargic, off their food, vomiting, have diarrhoea, or show rashes and round patches of hair loss should see a vet. Ozone treatment reduces germs in the environment; it is not a treatment for illness in people or pets.

What a flood costs a grooming salon or pet hotel

The health of boarded pets is the business

Pet businesses sell trust. If a dog goes home with an itchy rash, or a cat starts sneezing after a few nights' stay, the owner will think of the shop first, whatever the real cause. In the weeks after a flood, when everyone is already worried about germs, that risk to reputation is much higher than normal.

Every closed day is lost income

Most salons earn daily from bath appointments and boarding fees. Each day the doors stay shut is revenue gone, on top of replacing food, litter, towels, shampoo and electrical equipment, while rent and wages keep running.

Reputation in pet-owner communities

Pet-owner groups on social media share news fast, good and bad. A single review saying the shop smelled musty or that a dog came home with ringworm can cost months of new bookings. On the other hand, shops that communicate their recovery steps transparently often earn more trust after a crisis than before it.

Common fixes, and why they fall short

• Flooding the shop with strong bleach. Bleach works on hard surfaces that are already clean, but it does not reach into carpeted cat trees, plywood shelves or the voids under tubs. Strong fumes irritate the airways of animals, whose noses are far more sensitive than ours, and any residue left on floors ends up being licked.
• Spraying pet perfume to cover the smell. Fragrance masks odour briefly while the source remains. Heavy scents can also stress or make some animals sneeze.
• Only washing the towels and beds. Hot washing is good practice, but if the cupboards and shelves they go back into are still moldy, clean linen is recontaminated.
• Turning the air conditioning on straight away. If the coils and drip trays grew mold while the shop was shut, switching on simply blows it into every kennel.

All of these share one weakness: they work only on surfaces you can see or reach. A pet shop is full of air, crevices and porous materials. What is missing is a step that deals with germs in the air and in the places hands cannot get to, carried out after cleaning and drying.

WHD ozone disinfection for grooming salons and pet hotels

World Health Disinfection (WHD) provides residential and building ozone disinfection for homes, condos, hotels, offices, factories, schools and hospitals, including small commercial units such as grooming salons and pet hotels. Ozone (O3) is a powerful oxidising gas. Released into a sealed room, it spreads through the entire volume of air, reaching corners, the undersides of cages, the backs of cabinets and voids that cloths and brushes cannot. It breaks down the cell structures of viruses, bacteria and mold, as well as odour molecules, and then reverts to oxygen (O2), leaving no chemical residue on surfaces. That matters in a space where animals lick and lie on the floor.

According to the test results the company has had certified, WHD's ozone service was tested by Thailand's Department of Medical Sciences and by Intertek in the UK, with a stated 99.99% elimination of viruses, bacteria and mold. The certification documents are available on the company website.

The golden rule for pet businesses: ozone treatment is carried out only in an empty, closed space. Dogs, cats, rabbits, birds, fish tanks, reptiles, plants and every person must be out of the area, and nobody returns until the rest and ventilation period has finished. Animals have more sensitive airways than people, so keep them away until the team confirms the space is ready.

How the job runs in a pet shop

1. Survey and zoning. The team walks the premises with the owner and divides it into zones: wet room, grooming area, dog suites, cat rooms, food and linen storage, staff room. Room sizes and the flood line are noted.
2. Readiness check. Mud must already be removed, floors and equipment washed, and the space reasonably dry. Anything permanently damaged, such as soaked food, wet litter and beds that sat in sewage, should already be thrown away.
3. Everyone out. Animals boarding upstairs move elsewhere temporarily if the upper floor is included, or air paths to the upper floor are sealed if only the ground floor is treated. Fish tanks and birds leave too.
4. Seal the zone and open everything inside it. Linen cupboards, equipment drawers, the dryer door and every kennel gate are opened so the gas reaches inside. Doors, windows and vents to other areas are closed.
5. Run the ozone generator. A standard cycle takes about 30 minutes per zone, covering filling the room, contact time and a rest period before ventilation. Actual time can vary with room size and conditions.
6. Rest and ventilate. After the cycle, doors and windows are opened. The team tells you when people can re-enter and advises an additional wait before animals come back.
7. Wipe animal-contact surfaces and hand over. Wipe cage trays, bowls and grooming tables with clean water or a pet-appropriate cleaner used per its label, then welcome the first guest.

For ozone jobs worth 15,000 baht or more, WHD includes a free medical-grade disinfectant spray, handy for quick spot treatment of small surfaces during the working day once you have reopened.

10 reasons grooming salons and pet hotels should book ozone disinfection before reopening

1. It reaches where brushes cannot. The gas flows under tubs, behind the dryer and beneath cat condos, where silt and moisture hide.
2. It treats the air animals share. Ozone disinfection of pet boarding rooms deals with surfaces and air in one pass, which matters where many animals breathe together.
3. No chemical residue where pets lick. Ozone reverts to oxygen, unlike concentrated chemicals that can linger on trays and floors.
4. It helps get ahead of mold. Done after cleaning and drying, it reduces lingering spores in the air and on porous materials.
5. It removes musty smells at the source. Odour molecules are broken down rather than covered, so you do not need strong fragrance that bothers sensitive noses.
6. It is quick per zone. A cycle of about 30 minutes per zone makes reopening easier to plan.
7. It is backed by testing. According to company-certified test results from the Department of Medical Sciences and Intertek UK, 99.99% of viruses, bacteria and mold were eliminated.
8. It gives you a clear story for customers. You can explain that the shop was cleaned, dried and ozone-disinfected, rather than just saying "we mopped".
9. It protects the family upstairs. Fewer germs and less odour downstairs means better air rising into the bedrooms above.
10. One investment, long-term trust. Read more and book a survey through WHD's ozone disinfection service; jobs from 15,000 baht include a free medical-grade disinfectant spray.

Before and after ozone treatment in a pet shop

Note: results depend on site conditions, cleaning and drying beforehand, and care afterwards. Materials permanently damaged by sewage should be replaced.

Example case: a small cat hotel in a Lat Phrao shophouse

Example case (an illustrative scenario based on common jobs, not a testimonial from a real customer)

Beer runs a cat hotel in a three-storey shophouse. The ground floor is reception and storage; the second and third floors are guest rooms. During the flood, water only entered the ground floor, to about mid-shin, but the storeroom held litter, wet and dry food, blankets and more than twenty plastic carriers, all of which sat underwater for several days. Once the water dropped she threw out everything damaged, washed the floor and walls, and ran fans until it was dry. Yet a musty smell still drifted up the stairs to the second floor, and one of her own resident cats started sneezing more often.

Her first move was a trip to the vet. Then she booked a WHD survey. The team recommended treating the whole ground floor including the storeroom, plus the second floor next to the stairwell, because air from downstairs had been flowing up the whole time the hotel was shut. Every cat went to stay with relatives for a day. The team opened every washed carrier, every cupboard and drawer, sealed the stairway to the third floor with plastic sheeting, and treated one zone at a time. After the cycle and ventilation, Beer wiped the shelves and bowls again with clean water and waited a little longer before bringing the cats home.

Beyond the smell, what changed was how she talked to customers: she posted her full recovery process and told owners plainly that unwell cats should see a vet before boarding. Her regulars rebooked for the October holidays as usual.

Post-flood recovery checklist for pet salons and boarding

Before you call the ozone team

• Switch off ground-floor power before entering, and have an electrician check dryers, washing machines, sockets and plugs that were submerged.
• Wear rubber boots, thick gloves, a mask and eye protection when shovelling mud. Cover any cuts on your hands.
• Throw away all food, treats, litter and pet medicines that touched floodwater, even if the outer packaging looks fine.
• Discard beds, mats and carpet that soaked in sewage too long to dry thoroughly.
• Remove silt, then wash floors, walls, tubs, cages, trays and drains with clean water and detergent.
• Disinfect cleaned hard surfaces with a suitable product such as Chemgene medical-grade disinfectant, following the label dilution and contact time.
• Hot-wash towels and blankets you are keeping, dry them completely and store them outside the shop until treatment is done.
• Have the air-conditioning coils, drip trays and filters cleaned before use.
• Ventilate and run a dehumidifier until floors and walls are dry.

On treatment day

• Move every animal, plant and person out of the zone, including aquariums and bird cages.
• Open kennel doors, cupboards, drawers and the dryer cabinet.
• Stay reachable so the team can tell you when re-entry is safe.

After treatment

• Ventilate for as long as the team advises.
• Wipe bowls, cage trays and grooming tables with clean water before animals return.
• Take a small number of guests on day one and watch for coughing, sneezing or itching.
• Screen incoming pets, check vaccination records and ask owners of sick animals to see a vet first.
• Keep humidity under control and inspect damp corners weekly for the first month.
• Anyone with fever, calf pain or diarrhoea after the clean-up should see a doctor straight away.

FAQ: ozone disinfection for pet businesses after a flood

Can animals stay in the shop during treatment?

Absolutely not. Ozone treatment is only done in empty spaces. Every animal, including birds, fish and reptiles, must leave the zone and only return after the rest and ventilation period the team specifies.

If we book ozone, can we skip washing the shop?

No. Ozone is a step after mud removal, washing and drying, never a replacement for them. Leftover dirt reduces the effectiveness of every disinfection method.

How long does it take, and when can we reopen?

A cycle takes about 30 minutes per zone. A two-unit shophouse may be divided into several zones. The team will estimate total time, including ventilation, during the survey so you can plan your reopening date and tell customers.

Will ozone cure a pet's skin infection?

No. Ozone reduces germs in the environment; it does not treat disease. Animals with rashes, circular hair loss or unusual itching should see a vet. The shop helps by keeping the environment clean and dry to reduce the chance of spread between animals.

What should we tell customers about our recovery?

Be honest and specific: wet items discarded, surfaces washed and disinfected, the premises dried, air conditioning cleaned, and ozone disinfection carried out in empty rooms, plus how you screen sick animals. Avoid promising a "100% germ-free" shop, because no method can guarantee that.

Make your shop a safe second home for pets again

Book a WHD survey of your grooming salon or pet hotel. We will plan the zones and carry out ozone disinfection in empty rooms after cleaning and drying, so you can welcome customers back with more confidence.

Book a Pet Shop Ozone Survey

Call 065-556-6294 · LINE @whd268 · worldhealthdisinfection@gmail.com

Ozone jobs from 15,000 baht include a free medical-grade disinfectant spray.

Related links

• Residential and building ozone disinfection
• Ozone removal of chemical residue and odours, for paint and glue smells after renovation
• Chemgene HLD4H medical-grade disinfectant
• Contact us

References

• 2026 Bangkok floods (Wikipedia)
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• WHO fact sheets