The pug is the first, and it probably won't come as a surprise to most people. These tiny, wrinkled-faced puppies are notorious for having breathing problems because of their flat faces.
Although corgis were originally bred in Wales, United Kingdom, for herding, where they aren't as strong and athletic in the water.
Dachshunds have similar swimming issues to corgis because of their long bodies and short legs. Compared to brachycephalic breeds like the pug, they do have longer muzzles.
Don't be deceived by a boxer's long legs and athletic frame. They belong to the brachycephalic category and, like the pug, have a flat face and a short muzzle.
Shih Tzus struggle to maintain their head above water due to their short muzzles and small legs.
You shouldn't anticipate your basset to continue a hunt that takes him to any deep bodies of water because these short-legged hounds were originally bred for hunting.
These adorable little puppies are very light and have full muzzles, but they are also extremely sensitive to sudden changes in temperature.
Bull terriers are not naturally good swimmers; because of their short legs and deep chests, it will be harder for them to stay afloat.