At the vet clinic I work at, my boss tells me that he used to let cats go home the same day but he experienced too many disraught people calling at night worried too death that their cat was still groggy and disoriented (after being told that this may happen). He now makes all cats stay overnight. Dogs go home the same day.
Caretaker of 2 dobermans,, 1 schnauzer, 5 cats, 3 goats, 1 parrot, 1 bearded dragon lizard, 11 chinchillas.
Rest in peace, Cricket, Casey, Bella, Yank, Chloe and Bones.