The "dog" is allegedly a Schnoodle, which is a cross between a Poodle and Schnauzer. Schnoodles can get their asses kicked by cats easily. Sam, our cat, is reportedly sharpening his claws and planning an attack.
UPDATE (and a parody from Cider House Rules):
Dr. Larch: Rocco was adopted by a family today. We should all be happy for him. Let us all say goodnight to Rocco.
All: Goodnight, Rocco.
Dr. Larch: Good night, you kings of Maine, you princes of New England.
End Scene. (Interpret: Mom had to return the puppy.)
UPDATE: The dog, renamed Cosmo Kramer, has returned a happier, healthier puppy. Mom is happy.