Cruelty to animals
Uglybaldie brought up a good point about cruelty to animals.
When a vet gives an injection to a hamster, is that animal cruelty?
What about lab researchers who do the same in the labs? (See : http://www.brocku.ca/researchservices/ethics/animalcare/assets/documents/standardoperatingprocedures/health/health_15.pdf)
What about someone like me giving the injections to my pet hamster?
Worth pondering over don't you think?