Answer:

pet

Answer	Crossword Clue
PET	Class favorite
PET	Dino, to Fred and Wilma
PET	Favorite

PET	Tarantula, sometimes
PET	Vet visitor
PET	Cat or dog
PET	Gerbil or hamster
PET	Stroke gently
PET	Sulking fit
PET	Caress
PET	Teacher's favorite

PET	Creature of comfort
PET	Snoopy, e.g.
PET	Fido or Felix
PET	Lassie, to Timmy
PET	Darling
PET	Fave
PET	Classroom favorite
PET	Family dog

PET	Dear to one's heart
PET	Apple of one's eye
PET	Asta, to Nick and Nora
PET	Term of endearment
PET	Housesitter's company
PET	One that eats from bowls
PET	Collar wearer
PET	Water-bowl user (or the start of a film and TV actor's split personality)

PET	Spa visitor who doesn't pay the bill?
PET	Furry adoptee
PET	Animal companion
PET	Treat like a dog?
PET	Bad mood
PET	Cherished
PET	Garfield, to Jon
PET	Housecat, for one

PET	Household animal
PET	Vet's patient
PET	Parakeet, perhaps
PET	Furry friend
PET	Pal with paws