We have a 12 year old chihauha mix (Otis), who recently - within the past 2 weeks noticed he was looking a bit thin. His appetite however was normal...then he developed breathing issues, breathing very rapidly and almost raspy at times, more so if he was nervous, or if he barked it would make it worse sometimes to the point where he gags/dry heaves and his little cheeks/ lips flutter when he is having an episode. He is now very thin and he is no longer eating as of today, he hasn't had anything..we even made him a special meal of chicken breast with rice and a little broth he wouldn't touch it at all. Also noticed that even if he is lying down he tends to hold his head/neck up at an angle rather that putting it down to rest...so we would prop his head up in that position to make him comfy. Unfortunately money is an issue, so looking for a bit of advice/info to see if anyone knows what could be causing this. Would like to add that he has always been an inside dog aside from being let out in a fenced in area to do his business, and we've had him since he was a puppy. Any information would be greatly appreciated! Thank you in advance.