They like to cuddle.
They're kind of like babies only better because there are no diapers, no painfully long crying spells...I could go on and on.
You can sneak them into stores in your purse if you are so inclined.
They relieve stress.
I've yet to see an ugly puppy. Ugly dogs, yes. But no ugly puppies.
(Here is where I would insert a picture of maybe the cutest puppy ever. That would be Addison's puppy, Betsey, who we've been babysitting all weekend and spoiling rotten. But my camera cord is destroyed and I therefore have pictures in limbo.)
You get so lost in their cuteness that you forget about other stuff.
And lastly, PUPPY BREATH!