It is extremely stressful and heart wrenching when your little one is sick and I know how overwhelming it can be.
It sounds like you like your vet and trust what he is telling you so I would stick with that and try not to stress about it.
I used to feed Nutro and I have since read reviews and it does not seem to be as good as it claims to be so maybe a food change will definitely help.
Everyone on here will have different stories about their own dogs and everyone wants to help but it sounds like you have it under control and you are doing what is best for your baby!!
This is a wonderful forum and there are so many kind people who want to help but I know how overwhelming it can be to get so many different comments that are helpful but yet it makes your head spin because you are already stressed about your baby so just sit back and read the comments but don't look too much into them just do what
you think is best!!
It sounds like you have a wonderful relationship with your baby and I know you will take good care of him!!
I really hope the new diet works for your little one and I will pray that all goes well for you. Keep us updated!