When we adopted my bunny, he was really nervous and breathed really fast. We had him for about a month and he developed head tilt. Foster mom thought he it might be stress of new environment. Vet remarked how fast he was breathing.
2nd time my bunny got sick, we were renovating the room and had to move the to the basement. We tried to keep everything the same. He developed GI Stasis. We also learned he had chronic kidney disease. Since then, he has had a few bouts of stasis.
This fall, our pet sitter called as soon as he did not eat his full plate of food. His ear was drooping. Ear infection lead to head tilt. We are in constant contact with pet sitter via phone and email. They have rabbits and know how quickly my bunny (or any bunny) can go downhill from illness. This last time the vet thought he was missing us. He had just been checked by the doctor about 2 weeks before b/c he had GI Stasis. I told the vet about our vacation, they thought things would be o.k. but had our contact info just in case.
When I came home this time, he was listless. His ears were not up. He did not hop and run about. He usually runs and hops about when I feed him pellet or veggie, but he didn’t do any of that. He just sat there in his cage and was not excited about anything.