My dog has had a upset tummy ,the vet gave him a medication but he is still not eatting

Did you try calling the vet and seeing what he/she has to say?

I agree with zoe... maybe you should call the vet and see what they say. Are you feeding solid or soft food. If you are feeding solid foods maybe try making it more pleasing to your dog. We had a dog once with stomach problems she would go on and off her food. But we found that mixing a little soft food in with her solid food helped. But we didn't use canned dog food and we didn't use a lot. Just enough to make it smell and taste more yummy. We used a brand you keep in the frige that looked like it was people food lol... (it had rice and other things in it)

When my dog recently had a tummy problem my vet put her on S/D prescription can for a short bit, and told us to heat it up slightly to make it more appealing.