Three dogs -- one brown, one yellow and one black -- were sitting in the waiting room at the vet's office when they struck up a conversation. The black dog turned to the brown one and said, "So what hell are you here for"

The brown dog replied, "I'm a pisser. I piss on everything - the sofa, the drapes, the cat, the kids. But the final straw was last night when I pissed in the middle of my owner's bed."

The black dog said, "So what is the vet going to do?"

"Gonna give me Prozac," came the reply from the brown dog. "All the vets are prescribing it. It works for everything."

The black dog then turned to the yellow lab and asked, "Why are you here?"

The yellow dog said, "I'm a digger. I dig under fences, dig up flowers and trees, I dig just for the hell of it. When I'm inside, I dig up the carpets. But I went over the line last night when I dug a great big hole in my owner's couch."

"So what a re they going to do to you?" the black dog inquired.

"Looks like Prozac for me too," the dejected yellow dog said.

The yellow dog then turned to the black lab and asked, "Why are you at the vet's office?"

"I'm a humper," the black dog said. "I'll hump anything. I'll hump the cat, a pillow, the table, fire hydrants, whatever. I want to hump everything I see. Yesterday, my owner had just got out of the shower and was bending down to dry her toes, and I just couldn't help myself. I hopped on her back and started humping away."

The yellow and brown dogs exchanged a sad glance and said, "So, Prozac for you too, huh?"

"No," said the black dog, "I'm here to get my nails clipped."