Do the dogs swim?

I'm not sure what a raceway is so it's kind of hard for me to picture this. Could the dog have gotten hurt when falling in and not be able to swim. Are the sides high? Maybe he was exhausted from trying to get out. I guess many things could have happened, perhaps your dog panicked? Regardless I am sorry for your loss.

It can happen several ways, this is the most probable. Dogs can swim and float. If they dive in under water and are not used to the surprise of the water hitting their face and mouth they will swallow the water. Some dogs hold their breathe by instinct others HAVe to be tought.A tragic acceddent....

Well, most dogs do, but some struggle a bit. My cousin had a Boston terrier that really loved the water, but he couldn't turn and sometimes he just dropped down below the water so they had to pull him out before he drowned.

amazingly, dogs swim. even if there's no training on them and i envy them for having that natural skill coz i don't know how to swim XD

Of course dogs swim, It's part of their natural talent. They are born having that kind of talent, its part of their nature. And about the dog you just said, there could be a lot of reasons why it drowned. It could have leg problems that stopped him from swimming, or probably the dog panicked and just was so tired in trying to swim and climb back up.