Giraffes, orcas, wolves, bats, and pretty much anything mammalian, but giraffes are my number 1 favorite animal after horses.
If they ever breed dwarf giraffes, I'll be first in line to buy one!
Giraffes are the only truly mute mammal; they have no vocal chords.
What's not to like about giraffes? They're graceful, colorfully marked, and aesthetically pleasing.
Second after giraffes are leopards, interestingly enough for the same reasons I like giraffes, although I'd never want to own one. Large predators do not make good pets.
I don't like wolverines or hyenas, though. Wolverines because they're vicious brutes, and hyenas because I find them hideously ugly. I know they can't help it, but I still don't like 'em!