I own an english bulldog and an a small American Bull dog. I’ve used these multivitamins and they work out great. http://www.musclebully.com/product/vitabully/ They say for bullies but I’ve emailed them because I have a friend who’s just got a normal jack russell terrier and wanted to know if he can take them. They said yes as they are general dog vitamins just cater toward bully breeds. Go to Amazon because It’s cheaper there. Here is the link . The reviews are great also