Who is the best

Racehorses are fighting in a stable over who is the best racehorse.

The first horse says, "I'm the best because I've won 20 of my last 80 races."

The second horse says, "That's nothing, I've won forty of my last 60."

The third horse says, "I've won everyone of my 55 races."

Then a greyhound walks up and says, "I've won 180 consecutive races."

The horses' jaws drop. Finally one of the horses says, "Holy shit! A talking dog."