Summertime Safety Tips - Swimming Safely
While technically, dogs know how to swim, many are not very good at it. This is especially true of bracheacephalic or "smushed face" breeds such as bulldogs and pugs. In addition to the challenges posed by their short snouts, these breeds are top heavy, and not well suited for extended romps in the pool.
Many small dogs (like Grendel!) have trouble pacing themselves, and will run out of steam in the middle of the deep end. Never leave dogs unattended in or around a pool or lake. Teach them how to get out of the pool, and consider investing in a dog safe pool ramp.