A sudden diet change is one of the most common causes of soft stool and vomiting. The fix is patience.
The standard 7 to 10 day schedule
| Days | Old food | New food |
|---|---|---|
| 1 to 3 | 3 parts | 1 part |
| 4 to 6 | 1 part | 1 part |
| 7 to 9 | 1 part | 3 parts |
| 10 onward | none | all |
Slow down when needed
Dogs with sensitive stomachs do better changing the mix every two days over about a week of slow steps, or stretching each stage out. Whole Dog Journal warns that large jumps in fat content are a common cause of upset, so be extra careful when moving to a richer food. Watch for vomiting, diarrhea or reduced appetite, and slow down if the stool softens.
When to ask your vet first
Check with your veterinarian before changing the diet of a puppy, a senior, a dog on a prescription diet, or any dog with a medical condition. A bland diet for stomach upset does not need a transition at the start, but returning to regular food afterward should be gradual.
Why not to switch before boarding
A stay is already a change of place and routine. Add a new food and a loose stool is hard to read: was it the food, the stress, or something else? Keep the diet steady for at least a week before and during the stay.
How the kennel handles food
Your own food is welcome at no charge. Bring enough for the whole stay plus a bit extra, in its original bag, with the amount written in cups or tablespoons. Staff feed your dog's food the way you do at home. Prefer not to bring food? The house menu is grain-free kibble and a wet food, plus farm-fresh eggs, hot dogs and treats, all at no extra cost. If a dog refuses food, staff offer enticing extras. See food and special diets.
Signs the new food is not working
Soft stool for a day or two during a switch is common. Persistent vomiting, bloody stool, itching, a dull coat or a refusal to eat are not, and they are good reasons to call your veterinarian and return to the old food while you wait. Keep notes of what your dog ate and when, which makes the visit more useful and also helps if you later want to write a clear feeding plan for a stay.