there is a parvo test the vet could do if he thinks that is what it might be. it sounds like he is giving him the worming medication on a whim and if that doesn't work then he thinks it may be parvo. that's not something you want to mess around with. also, if bruizer has been lethargic and vomiting, intestinal parasites is not what i would go with. if he continues to not do good i'd get a second opinion.
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