GNC Ultra Mega Multivitamin Plus Advanced Support for Senior Dog 60 Count Chewable Tablets by GNC Pets Includes omega-3 fatty acids to support healthy skin and coat. Also added chondroitin to support healthy joints. Especially formulated for senior dogs Advanced support for general health as well as a boost to the immune system. For more than 75 years, GNC has been the leader in the development and manufacture of human dietary supplements. Now, GNC's commitment carries over to Pet Products!