Coming from Laos that sounds a bit funny, but it turned out (thanks to Jan's hint) that there is a dog swimming pool right around the corner in Soi Bearing. It's called "All About Dog Spa" (on Facebook you will find it as "Moobrador"). The owner speaks fluent English and is really dedicated to dogs. He is breeding Labradors as well, in case you want a puppy.
But let's get back to the swimming. Yoda never ever was in a pool or anything different from the puddles in the street after the rain. So we were a bit nervous about him. But it turned out to be easy: staff is treating the dogs very well and carefully, moving him slowly into the water. A safety vest is mandatory, as well as a shower and a "toilet visit" previous to the swimming lesson.
Although I understood that you can make an appointment for just an hour of swimming, the main focus seems to be on swimming therapy. A lot of dogs coming there have problems moving their legs, mainly the beg legs. Cause can be an accident or an disease. I witnessed several dogs not able to move the legs will lying down, but when they went in the pool they paddled like a baby.
Costs depend on how many times you want to come. There is a membership fee (1500 Baht), and we payed about 600 Baht (20 USD) per hour. That includes showering, shampoo, dry blowing and ear cleaning after the swim.
Thu - Fri: 9:00 am - 4:00 pm
Sat - Sun: 7:00 am - 4:00 pm
Soi Bearing (Sukhumvit 107). From Srinakarin Road turn into Soi Bearing, watch for a Mercedes Dealer on the left side and then it's about 50 meters down the road, a small gate on the left.