@ Helen S
Please listen to the folks that you adopted the dog from.
The worst thing you could do right now is make any change to his diet. never mind a drastic change.
Raw sucks and will most likely cause more problems. No reason for it.
Please go here http://skeptvet.com/Blog/ for science based veterinary information, use the search engine there to look up nutrition .
Find a vet that you like and trust and work closely with him if the dog’s symptoms continue.
But, honestly it takes an adult at least a month to adjust to a new home.
Patience.
There are no veterinarians or veterinary nutritionists affiliated with this site.
But I suspect there are vet haters.
(I am not a vet)
Other sites you may find helpful: Reddit Ask a Vet, or Reddit Dogs.
Good Luck
