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  That's pretty normal and doesn't mean they necessarily did anything wrong.  I myself have had blood taken from my arm, and sometimes I bruise a little and sometimes I don't.  When Lacy had blood taken last she had no bruise at all, but my cat bruises badly everytime she has blood taken.  Usually what they will do to reduce bruising is put pressure at the site as soon as they take the needle out...you try to put pressure on it for a couple minutes afterwards.  
				__________________ ~Magnifique Yorkies~Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
 Educate yourself and buy from reputable breeders or rescue.
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