My dog is not fit

Hey guys, this is me John here. Today I am going to share a problem and I want the solution to this problem from you guys. Actually, my dog is not healthy. Before 1 weak I gave him meat in his diet and after having that meat he started to feel sick. Now my dog is continuously vomiting and appears very tired all the time. I don’t why but he is facing many physical issues. It has been 4 days I am regularly taking him to hospital and they told that is not a major problem it will take some to recover. Now his weight is decreased from 35 to 30 kg which is not normal. Guys, please tell me what I need to do for his wellness. Just give me some instructions to follow to make my dog healthy.

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