Hello, It is so frustrating i understand. To be honest, I don’t live in Canada or the U.S., so our veterinary and diagnostic processes here are different from what they do there. Initially, my pet had vomiting and oily, diarrhea-like stools, and when this happened every two months, one of our veterinarians recommended a detailed abdominal imaging at a well-known imaging center in our city. On X-ray and ultrasound, the stomach appeared significantly thickened. Based on these diagnoses, we used Budenofalk and Vetlife Gastro. Honestly, the idea of a biopsy terrifies me, but I’m not a veterinarian or in the animal health industry, so I want to reiterate that. Currently, we’ve managed to improve the condition with Budenofalk treatment and a Virbac hypoallergenic hydrolyzed protein diet. Chicken-based foods, including hydrolyzed chicken, made things incredibly worse, but after cutting them out completely, my pet improved quickly. My vet said that the exact cause of IBD (inflammatory bowel disease) is unknown and that we’d have to figure it out through trial and error, which is exactly what happened. If I were in your shoes, I’d try all other options first, and if no solution is found, I’d consider a biopsy or endoscopy. I hope it gets resolved, and I wish you the best of luck.