I'm so sorry that sweet Angus is hurting I know how upseting it is to see your baby ache. I have never heard of the vitamins, but I hope they help. Have you asked your vet about the correct aspirin dosage for Angus? I have always given my girls the enteric coated aspirin Liz mentioned...much easier on the stomach. When my Jing (RB) started having such aches and pains, I got her a heated, orthopedic doggie bed and that, along with glucosamine and aspirin and massage helped a lot. Please give Angus a great big feel better hug and kiss from all of us. Love, Sandra, Cody and Star.