I got a lovely new puppy last week and I have just dewormed it. Since I gave him the worming tablets, he has been lethargic and not his usual happy and wild self, and he has also had terrible diarrhoea which I am sure is normal. But is the lethargy due to the worming? What are the most common side effects of worming a puppy? Sorry if this is a stupid question, but I am a new dog owner!
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