I have a few.

"If you think dogs can't count, try putting three dog biscuits in your pocket and then giving Fido only two of them."
--Phil Pastoret

"There is no psychiatrist in the world like a puppy licking your face."
--Bern Williams

"Dogs are our link to paradise. They don't know evil or jealousy or discontent. To sit with a dog on a hillside on a glorious afternoon is to be back in Eden, where doing nothing was not boring--it was peace." - Milan Kundera

"To err is human, to forgive, canine." - Unknown

"Money will buy you a pretty good dog, but it won't buy the wag of his tail." - Henry Wheeler Shaw

"I think dogs are the most amazing creatures; they give unconditional love. For me they are the role model for being alive." - Gilda Radner

"No matter how little money and how few possesions you own, having a dog makes you rich." - Louis Sabin

My personal favorite.
"A Golden Retriever is love and devotion, wrapped in sunshine"
-Anonymous