How to Switch Your Dog to Grain-Free Wet Food Without Upset Stomach
By Harringtons Pet Food | Published: 2026-10-15
Category: 사용 방법 가이드
A simple, vet-informed schedule for switching your dog to grain-free wet food without diarrhoea or refusal. Includes mixing ratios, red flags, and product picks.
Quick answer
Switch your dog to grain-free wet food over 7–10 days by mixing increasing amounts of the new wet food with their current food. Start with 25% new food and 75% old, then move to 50/50, then 75/25, and finally 100% new. Go slower—10–14 days—if your dog has a sensitive stomach or has reacted badly to food changes before.
Why a slow transition matters for wet food
Wet food has a different moisture content, texture, and fat profile than dry kibble. A sudden switch can overwhelm the gut bacteria that help digestion, leading to loose stools, gas, or vomiting. A gradual change gives those bacteria time to adapt. If your dog is moving to a grain-free recipe, the change in carbohydrate source (e.g., potato instead of wheat) is another reason to go slowly. The goal is to keep the total daily calories roughly the same while shifting the food type—wet food is often less calorie-dense, so you may need to feed a slightly larger volume. Check the feeding guide on the pack and adjust based on your dog’s body condition.
Stomach-friendly transition schedule at a glance
Use this 7-day plan as a baseline. For sensitive dogs, stretch each stage to 2–3 days. Always mix thoroughly so your dog can’t pick out favourite pieces.
- Days 1–2: 25% new wet food + 75% old food
- Days 3–4: 50% new wet food + 50% old food
- Days 5–6: 75% new wet food + 25% old food
- Day 7: 100% new wet food
- Days 8–10: monitor and hold at 100% if stools remain normal
How to mix wet and dry food without waste
If you’re transitioning from dry to wet, you can mix both in the same bowl. Start by replacing a small portion of kibble with wet food, then gradually increase the wet amount. Warm water can be added to dry food to soften it and make the texture more similar to wet, which helps picky dogs. For dogs on a fully wet diet, divide the daily ration into two or three meals to reduce the risk of gulping and bloating. Store opened wet food in the fridge for up to 24 hours (or as stated on the can) and bring it to room temperature before serving—cold food can be less appealing and harder to digest.
Red flags: when to pause or call your vet
Mild soft stools can happen in the first few days, but watery diarrhoea, repeated vomiting, lethargy, or loss of appetite are not normal. If you see any of these, stop the transition and return to the previous food. Contact your vet if symptoms last more than 24 hours or if your dog seems unwell. Some dogs have underlying sensitivities (e.g., to chicken or beef) that a grain-free diet won’t fix—grain-free is not automatically hypoallergenic. If your dog has a known allergy, choose a recipe with a novel protein and check the label for cross-contamination risks.
Step-by-step transition plan
- Set a baseline and pick your start day: Weigh your dog or use a body condition score to estimate current daily calories. Choose a day when you’ll be home to monitor stools. Common mistake: starting on a busy weekend or right before a trip. Checkpoint: you know how much you currently feed and have 7–10 days of the new food ready.
- Introduce 25% new food for 2 days: Mix one part new wet food with three parts old food. If your dog is on dry, you can moisten the kibble with a spoonful of warm water to blend textures. Common mistake: serving the new food cold—warm it slightly to room temperature. Checkpoint: stools should remain firm. If they soften, stay at this ratio an extra day.
- Move to 50/50 for 2 days: Increase to equal parts new and old. Stir well so every bite is coated. If your dog picks out the new food and leaves the old, you may need to crush the kibble or mix more thoroughly. Common mistake: free-feeding—stick to set meals so you can see how much is eaten. Checkpoint: no vomiting, gas, or diarrhoea. If any occur, return to the previous ratio for 2 days.
- Increase to 75% new food for 2 days: Now the new food dominates. Watch portion size: wet food is less calorie-dense, so you may need to feed a slightly larger volume than dry. Use the pack’s feeding guide and adjust to keep your dog’s weight stable. Common mistake: guessing portions—use a measuring cup or scale. Checkpoint: energy levels and appetite remain normal.
- Transition to 100% new food on day 7: Serve only the grain-free wet food. Divide the daily amount into two or three meals. If you’re using a mixed bumper pack, you can rotate proteins now, but introduce one new protein at a time over a few days. Common mistake: switching proteins and food type simultaneously—keep one variable stable. Checkpoint: after 3–4 days on 100%, stools are consistently firm and your dog is eager to eat.
- Monitor and adjust for the long term: Once fully transitioned, keep an eye on weight, coat condition, and stool quality for the first month. If you see persistent soft stools, your dog may need a different protein or a slower reintroduction of the old food. Common mistake: assuming grain-free is always better—some dogs do fine on grains, and the issue may be another ingredient. Next step: if problems continue beyond a week, consult your vet to rule out other causes.
Grain-free options for a smooth transition
- Just 6 Chicken & Vegetables Dry Dog Food 2kg: Just 6 Chicken & Vegetables Dry Dog Food 2kg is a complete, grain-free dry food with over 50% chicken and salmon and added fresh-baked bites. If your dog is currently on a grain-free dry food, this can be used as the base while you introduce wet food, keeping the protein source consistent.
- Grain Free Poultry Selection Wet Dog Food Bumper Pack 6 x 150g: Grain Free Poultry Selection Wet Dog Food Bumper Pack 6 x 150g contains 3 x Chicken with Potato & Vegetables and 3 x Turkey with Potato & Vegetables. It is a complete grain-free food for dogs aged 8 weeks and above, made with a FreshCook process and human-grade meat. The small 150g trays are ideal for starting a transition because you can open just one at a time and avoid waste if your dog needs to slow down.
- Grain Free Mixed Wet Dog Food Bumper Pack 16 x 400g: Grain Free Mixed Wet Dog Food Bumper Pack 16 x 400g is a hypoallergenic recipe that is easy to digest and contains no wheat, dairy, soya or pork. It includes Chicken & Potato with Vegetables, Duck & Potato with Vegetables, Salmon & Potato with Vegetables, and Turkey & Potato with Vegetables. The variety of proteins lets you test which one suits your dog best, and the 400g size works well once your dog is fully transitioned and eating larger portions.
