Dog got upset stomach from joint supplement — what to try instead

Digestive upset from a joint supplement is more common than people realise — glucosamine at high doses can cause loose stools or stomach upset in some dogs, particularly at the loading dose stage. Was the upset present from the start, or did it develop after a week or so?

That's a classic glucosamine GI response — some dogs just don't tolerate it well at the loading concentration. The good news is there's a strong alternative that sidesteps glucosamine entirely: Flexadin Advanced. It's built on undenatured type II collagen (UC-II), which works through a completely different mechanism and is substantially gentler on the digestive system. Give it with a small amount of food — the collagen mechanism is actually most effective on an empty stomach but for dogs with any GI sensitivity, a light accompaniment reduces the risk of upset. One tablet daily.