I give Ester-C 1000mg and Glucosamine 1500mg daily. I have in the last year taken my dogs off the glucosamine pills and buy MSM at the feed store for horses. It is a sugar constistency type and i dont have to crush pills or hide them, it lasts forever since these guys are smaller than a horse. It made things easier for me.
The Ester-C is for lubricating joints and immune system.
I wouldnt overload on supplements just the ones that are needed.
There is NOTHING worse then over doing Vitamins..lol...I've done it...Trust me-Extra YuckY!
Here is another supplement that I REALLY like and it's very simple to give-Dogs love it. Check out -link- 800-474-7044. I stared giving this to my pack a few months back, right when everyone started to blow out their coats-Stopped the major de-shed for the year-Not spots on the coats either!!! I have been very happy with it-Also great for a prenatel.