Help! My Dog Vomits After Every Meal! (Vet Answered)
This question has been answered by a vet
Veterinarian & Animal Behaviorist
With nearly two decades in veterinary medicine, Dr. Paola brings hands-on experience across multiple species. A graduate of the University of Guadalajara, she specializes in preventive care, animal welfare, and positive reinforcement training.
The Question
“Hi Dr. Paola,
My dog Codie is a King Charles Cavalier and Maltese mix. I have had him on Purina food since he was a pup, and started with Purina ONE Smart Blend. I recently bought the Purina True Instinct dog food with real turkey and venison to give him a variety of tastes, but this one makes him vomit every time he eats it. Why could that be? He will be 3 years old in May. Please explain why one formula was fine and this one is not. Thanks!” – Donna
Quick Info about Codie
Hi Donna, it sounds like Codie may have a sensitivity or intolerance to one of the ingredients in the new food. Even though both Purina ONE SmartBlend and True Instinct products are from the same brand, their formulations differ in protein sources, fat content, additives, and digestibility. Dogs, just like people, can tolerate some foods well while others upset their stomach. Since Codie vomits every time he eats the new blend, it suggests that something in the formulation isn’t agreeing with him.
There are a few possible reasons for this reaction. One is that he could have an intolerance to venison, which he hasn’t been exposed to before, or there might be a higher fat content that is too rich for his digestive system. Another possibility is an ingredient like peas, lentils, or certain preservatives that differ from what his system is used to processing. Sudden dietary changes can also trigger gastrointestinal upset, but since he reacts every time he eats it, it’s more likely an issue with the food itself rather than just the transition.
To keep Codie comfortable, I’d recommend stopping this food immediately and returning to what he was eating before. If you still want to offer variety, introduce new proteins gradually, one at a time, to see how he tolerates them. If vomiting persists even after switching back, it would be best to have him checked by a veterinarian to rule out any underlying conditions. Keeping track of which proteins or ingredients cause an issue can help guide you toward the best diet for him.
All the best,
Dr. Paola