Written in quotation marks tends to be the pets name. alerts to behaviour wouldn't be in quotation marks, and would be things like 'bitey' 'spicy' 'angry' etc.
I would be interested in knowing what the cats name actually was...
Maybe someone was being a dick and forgot to rub it out, maybe it was written on the kennel when another patient was in there, perhaps one of the staff's pets (thinking of the time my vets own dog was in, and his kennel had TWATDOG written on it!).
As long as they treat my animals with patience and kindness, I couldn't give a shit the language they use when labelling kennels, my pets can't read! (And would all answer to 'fuck face' or 'fuckwit' quite happily anyway!).