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why has my rottwieler lost weight and has sores around his butt?

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I have a Rottwieler, I took him to the vet for his shots twice. He started losing weight,his eyes looked pale,he stopped eating, and sores broke out on his butt and stared to spread.I called a vet to see what's wrong. He gave him a shot and told me to by a tonic,I did. I helped. He started to eat again but his poop has worms in it. Is he going to die what should I do?