Hi @Kimberlie - I learned this a while ago. If he's doing great on it, and is not having any major issues, do not switch. If you do, you may end up opening more issues. Alot of bullies don't do well with grains or chicken.... so maybe this could be causing the tear stains? But if they aren't really bad, then I wouldn't worry. If you start to notice excessive stains, shedding, itching, redness, then yes time to switch but for now, I wouldn't. If the time ever does come or you decide to anyway, I would go with something 4 stars or higher, and grain free. Also for the vinegar, do apple cider, a pure raw brand like Bragg's.
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Hugs to Murphy!