When TJ was 13 weeks old, he started to poop issues. The gurgirling noises like a monster was inside him, he refused food and water and I knew he didn't feel well at all. When he would poop (could be 10 mins or hours later) it would be an inch of formed poop and globs of orange mucus. Once this poop was out, he felt better and was starving....
This went on and on and got worse and worse and ALL the time. I was at the Vet at least 2x a week. We did fecal samples, did a wormer (just in case), he was on flagyl 2x (didn't work) ~ then we tried a special diet (duck and potato) and nothing else but he still wasn't getting better. Finally we did blood work, all was good expect his folate levels were very, very high. He had an overgrowth of bacteria in his small intestines = IBD
The Vet suggested giving him Tylan Powder (everyday, just a tiny bit) as this does help *some* dogs with these issues. Well, this was the answer for TJ. He was on Tylan for at least 6 to 8 months, but the Vet assured me that Tylan is pretty safe for long term use. His own dog was on it for life.
I am not saying this is the answer for you, but it might be worth it to suggest to your Vet....
Also, if you want to read more about TJ "episodes" as I call them...Do a search here on YT for Tylan and all my old threads should come up (from 2005).
Keep us posted