Is this an incredibly mean act by Mr. Mittens? Sure. Is he really just taking his anger out on the animals, and not the vet directly? Sort of. One assumes a vet losing all of its animals to a rabies outbreak can’t be great for business. But yeah, Mr. Mittens is mostly just being a jerk.
MITTENS: Disposing of some leftover Alka-Seltzer tablets.
NURSE: Doctor, what should we do? All the animals have rabies!
VET: The horror...the horror...
NURSE: Oh my God! One of the hamsters is so rabid that it just exploded!
VET: Burn it down. Let it burn, and salt the earth.