No, they don’t all contain it, just the “better ones” do. One of my dogs requires a pretty good dose of digestive enzymes, and I do rotate, but I’ve never noticed any problems with him even if I give him a double dose of enzymes with bromelain. I don’t think I’d feel good about giving him an enzyme supplement that was just bromelain though. As long as it is just part of a multi-enzyme supplement and you aren’t seeing problems, I wouldn’t worry. That said, I do rotate everything, including what enzymes I use. If you are worried, then I would use the one with bromelain every other or every third day. The intestinal lining repairs very quickly once whatever is causing damage is removed unless the damage is severe and you would know it if it was.
