What to do with vomiting dog? Vets can’t find cause

@daughtersisterpartnermom I would say try switching him back to the food that he was being fed by the breeder but, at this point, you may have missed that window and just thrown the poor guy's stomach completely out of whack unless you ease him into it. It's worth a shot though and, as others have mentioned, please try not to ever abruptly change a dog's food on them going forward. Some dogs, like my little old rat terrier, have stomachs of steel and can handle just about anything you throw at them. Others have much more sensitive stomachs and anything but a slow transition can cause... Well, you've found out what it can cause the hard way.

Stress from being in a new environment could also be a contributing factor, it's a lot of change happening at once for a little dog, especially a breed that's known to have health issues.

If nothing else is working, I would suggest trying to transition back to the food the dog is used to with the formula below to see if it helps(with the "new" food in this case actually bring the old food and the "old food" being the chicken and rice):

Day 1: 75% old food, 25% new food.

Day 2: 70% old food, 30% new food.

Day 3: 60% old food, 40% new food.

Day 4: 50% old food, 50% new food.

Day 5: 40% old food, 60% new food.

Day 6: 25% old food, 75% new food.

Day 7: 100% new food.

A bit of familiarity might help him settle into his new environment. Worth a shot?
 
@daughtersisterpartnermom My dog gets like that. He has IBD caused by food allergies (suspected, we can’t afford the biopsy to actually confirm this). The illness lasts because the food causes inflammation in the gut even if not eating.

Try him on hydrolyzed protein kibble (I think you can only get this at the vet). It’s helped our guy a lot, he still has a lot of flare ups but his poop is a lot more stable now and he doesn’t throw up every meal.
 
@daughtersisterpartnermom I highly recommend seeking out an internal medicine specialist. Hiatal hernias are extremely common in Frenchies and cause vomiting and regurg. Aspiration pneumonia in short muzzle dogs can be deadly.

Edit to add: I worked at a top teaching hospital for ten years. That's how I know.
 
@car54dwi This. Our dog went through the exact same thing after having him on ‘chicken and rice’. Switched EVERYTHING to chicken free and lamb as main protein and have never had a problem since.
 
@daughtersisterpartnermom Did your dog have a fasting blood test for the liver followed by a test an hour after feeding?

It took a while before doing this occurred to my vet, turns out my girl has a liver shunt. I was getting desperate as it felt like she was starving to death.
 
@elisabethjane This. My dog (as it turns out) has reflux and would throw up ALL THE TIME and he's a 100-lb-er so no small issue. Took us forever to figure it out. He now has an Omeprazole with dinner and is completely fine.

He also has allergies and IBD and is on a very expensive diet...try the simpler/cheaper solutions first before committing to $150/month for food 😬
 
@daughtersisterpartnermom There are some dogs that need to sit up to eat. They even make special chairs for it. It might be difficult for him with the frenchie body but put down some towels and prop him up like a baby in the corner of a couch and slowly feed him and then make him sit for 10-15 minutes and see if that works Article on it
 
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