Gun Dog Supliments

Im looking to get more information about supplements for my dog as he ages. Ive been working with a few vets and manufactures to develop a new glucosamine supplement for my dog and am interested in other peoples experiences with these types of supplements. Ive tried a few and some seem to work and other dont seem to have any impact.



What have been your experiences using a Glucosamine or other joint supplement? What issues have you had?