Well, vegetarians sometimes eat food products that aren't made from meat, but are made to imitate it. Quorn comes to mind. If they eat imitation meat, then there's no reason they won't eat animal crackers...
my friend is a vegetarian, but she would totally eat animal crackers because she is a vegetarian to be healthy, not so much because of animal cruelty.
does that make sense?
i don't know though, maybe i should offer her some animal crackers and see what she says.