An aggressive dog or cat? Generally in both, the animal is starting to feel its hormones, and should be fixed. If it's a matter of unprovoked aggression in an aggressive breed, then training by a professional is needed. Either that or find a breed society who will try to help. The shelter will put down an aggressive animal. Call the Humane Society to get other ideas.
I dont think they can if you want to make sure call them on Thursday Friday and Saturday if they say no then call another shelter
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