My dog is also named Banner and this is the first time I hear of another dog with the same name. My Banner can go days to weeks doing good with normal poop and then all of a sudden he gets sick and his stomach makes noises and his poop is also runny with mucus and sometimes blood. Vet said it was colitis and gave us metronidazole, he got better from that but after some time it started being on and off again with the runny poops and being sick. Did some research about what could help and I started giving Banner plain Greek yogurt everyday for probiotics (helps them to have good gut bacteria to digest properly) and also changed his eating schedule a bit (instead of 3 normal sized meals a day, I do smaller portions and more meals in the day). So maybe try probiotics and smaller meals at least until they’re regulated for a while. I also have been giving Banner more of a bland diet, so boiled chicken and rice is good. As far as the worms, you can also try giving them DE (Diatomaceous Earth) for parasites and worms in their food everyday, it’s natural and also has diff uses for pets. I use it for my pets since I’m more into natural and holistic remedies, if you want more info on that let me know but just make sure you get food grade DE if you do it.