A great dane, a scotty, and a chihuahua were sitting in a bar, knocking back a few, when a beautiful bitch walked in.

"Okay, boys," she purred. "I'll make a very happy dog out of whoever can come up with the best proposition, using the words 'cheese' and 'liver'."

The great dane thought a moment, then stated, "I don't like cheese, but I sure like liver, and I like you, too!". He panted and wagged his tail.

The lady just looked away.

The scotty immediately said, "I like cheese, and I like liver, AND I like you!", and wagged his tail expectantly.

She ignored him.

Then the chihuahua growled, "Liver alone! Cheese with me."

They left together.