While I do a rotational diet switching between dog foods, everyone in my house gets the same dog food from 6 month old to 15-year senior. It makes my life easier and unless there is a specific reason (allergies, kidney, liver disease or such) there is little compelling reason to keep numerous bags of dog food around–everyone benefits from good protein no matter what the age. Blood work on seniors is perfect even with proteins in the 30%+ category. They just get fed less to make up for a more sedate pace. Does the Foxhound get fed prior to exercise or gulp his food? If the throwing up continues, talk to your vet and rule out an illness.
