I think this is why my vet kept Hanna overnight - I would be torn apart to see my kitten like that too.

One of our dogs (Rocky) had his teeth cleaned a couple weeks ago, and we took him home the same night. He was definitely out of it from being put under- he had some problems walking and he couldn't eat that night (vet's instructions). I felt really bad for him. He was feeling like himself the next morning.

I think some places spay kittens really young - like 8 weeks - so I wouldn't worry about the too small stuff. The vets weigh the animals before they give them anesthesia so they know how much to use.

She will more than likely be fine tomorrow morning and be happy to get home.