Oh my, poor Tahoe. I hate when they aren't feeling so well.
TJ has IBD - when he was younger he would have these horrible episodes. These noises would come from him and I swear it was a monster inside him. He WOULD NOT eat during the episodes, and he would at some point during the day poop out pure mucus globs, orange in color. As time when on, he would have pure liquid poops too and sometimes vomit
We did fecals and nothing. We try flagyl and nothing. We tried a limited protein diet (duck and potato) and nothing. We did a complete blood panel and everything was fine except his folate levels that were sky high. The Vet could venture to say he has an overgrowth of bacteria in his intestines.
He would up giving me some Tylan Powder, which may or may not work, but it is given to dogs with colitis issues and seems to help. And it did, not over night, but in time it controlled and then stopped his episodes. TJ was on it for about a year and we were able to take him off. Tylan is very safe for dogs and even if they have to be on it forever, its ok.
Keep us posted - Tahoe is in my prayers