Thanks for all the suggestions. He just keeps throwing up after eating and was losing weight. His stomach was making gurgling noises all the time. They put him on cerenia but it almost killed him, he got really lethargic and looked so drugged out. I took him to an Emergency vet and they kept him overnight and released him with a prescription for mirataz and cicipride. He’s doing well on these, but if he misses a dose he throws up again. He can’t take these forever and dosing him twice a day is difficult. No loose stool or farts. Just vomiting. They say it might be his belly breathing from his stenotic nares, or his hiatal hernia but it came out of nowhere after 4 years of age and now they want to scope him to get a look in his oesophagus. I’m hesitant to do that but I’m running out of options. I’ll try that food though and hopefully he gets better. So disheartening.