My Patches is extremely finicky, and very much a one protein source kind of cat! Her eating habits frustrate me to no end some days! She's definitely got her quirks. It took me forever to transition her to canned wet, I started her out on shredded cooked chicken with parmesan cheese, and then slowely added Wellness turkey. She would only eat canned Wellness turkey, and sometimes chicken. There was only a couple other brands of turkey that she would eat.
When we started having problems with allergies, I switched to raw rabbit. First Natures's Variety, and then whole ground rabbit. Each switch to something new was at least a weeks transition, but it has to be rabbit, she won't accept anything else. If she eats it, then I switch her to something new, it takes a minimum of a week. If I switch her back to the previous food, she refuses it, and it's like transitioning her all over.
Right now her little quirk is refusing between each new batch, and it takes a couple days to get her back on track. She's started doing this really funny, yet really odd thing. If she refuses to eat her rabbit, I put 4 small kibbles of dry in the dish, and then she eats right away, leaving the kibble. It's just so weird! After a couple days she's back on track, and will eat without the kibble in the dish.
She's definitely a one protein source cat though. She'd rather starve than eat something new! She can be very stubborn!
Thankfully though, no vomiting. That was reduced to next to nothing after switching to raw.