Greyhound in a horse stable
A greyhound was walking by the race horse stables before a derby and couldnt help but overhear the horses talking amongst each other. As he walked past he heard one horse comment: "I've ran 35 races and won 29 of them." As he walked further he heard another horse say "I've ran 100 races and won 99 of them." The greyhound couldnt help himself any longer, and stopped in the middle of all of them to proclaim "thats nothing, I've ran 500 races straight and never lost!" The horses looked at each other in astonishment for a few seconds before one shouted out: : "Holy ****!!! A talking dog!!!
I know, I know...........