Before my 10 year old cat, Caesar, diagnosed with diabetes 2 days ago, I gave him glucosamine (Closequin) & anchovy/sardine oil (Omega 3 Pet) daily. I have been so vigilant about his food, giving only prescription DM for the past few days. I am worried to give him his glucosamine and fish oil because I'm paranoid that it will raise his blood sugar. He is on Lantis, two shots/day. The fish oil & Closequin really helped his arthritis. He's been on glucosamine since Jan. 2016 and fish oil since Oct. 2016. Please let me know what you do for your diabetic, arthritic cat. Do you mix glucosamine and or fish oil with insulin? Thank you, this forum has really been a source of information the past few days!