At ardam, formerly CDK9 Raw, we get plenty of questions from owners who are curious about fish but are not sure where to start. Fish is one of the most nutrient-dense proteins you can add to your dog's diet, but jumping straight into a full fish-based meal can sometimes be a bit much for a dog used to kibble or a single familiar protein. This guide walks through exactly how to introduce raw fish gradually and safely, so your dog gets the benefit without any unnecessary upset.
Setting Realistic Expectations
Every dog transitions at their own pace, and there is no single timeline that fits every household. Some dogs take to fish within a couple of days, while others need closer to three weeks of gradual increases before it becomes a comfortable, regular part of their diet. Patience during this process pays off, and rushing rarely speeds things up in a meaningful way.
Why Bother Introducing Fish at All?
Fish brings a nutritional profile that is genuinely different from land-based proteins like chicken or beef. It is naturally rich in omega-3 fatty acids, which support skin and coat condition, and it tends to be gentle on digestion for many dogs. Fish is also often more affordable than premium red meat cuts, making it a practical way to add variety to your dog's diet without blowing the budget. If you want to understand the full nutritional case for fish in more depth, our article on fish for dogs covers the nutritional detail, while this guide focuses specifically on how to make the switch smoothly.
Step One: Start Small
Do not serve a full fish meal on day one. Begin with a small amount, roughly a tablespoon for a smaller dog or a couple of tablespoons for a larger breed, mixed into their existing food. This lets your dog get used to a new smell and taste without overwhelming their system or their curiosity. Watch closely over the following 24 hours for any signs of digestive upset before increasing the amount.
Step Two: Increase Gradually Over One to Two Weeks
Once your dog has handled the initial small serving well, gradually increase the proportion of fish in their meals over the following one to two weeks. There is no need to rush this process. Slow and steady is far more likely to result in a smooth transition than switching everything overnight, which can sometimes cause temporary digestive upset regardless of how good the food itself is.
Step Three: Introduce Whole Pieces and Textures
Many dogs are introduced to fish first as part of a mince or mixed blend, which is a great starting point. Once they are comfortable, you can begin introducing small whole pieces or softer bone-in options under supervision. This variety in texture also supports natural chewing behaviour, though any bone content should always be appropriately sized for your dog and supervised.
Step Four: Settle Into a Rotation
Once fish is a comfortable part of the diet, it works well rotated alongside other proteins like beef, chicken and duck. This keeps meals varied and interesting while giving your dog access to a broader nutrient profile across the week rather than relying on a single protein source indefinitely.
Common Hiccups During the Transition
Some dogs are hesitant about fish simply because the smell and texture are unfamiliar. If your dog turns their nose up at first, try serving a smaller amount mixed thoroughly with a familiar food, or slightly warming the portion to release more aroma. Loose stools in the first day or two of any new protein are common and usually settle once your dog's gut adjusts, but ongoing issues beyond a few days are worth discussing with your vet.
Choosing the Right Fish to Start With
Not all fish are equally well suited to a first introduction. Milder, oily fish such as sardines or mackerel tend to be well tolerated and are packed with beneficial omega-3s, making them a sensible starting point. Avoid scavenger species and any fish known to carry higher mercury levels, and always source fish intended for raw feeding from a supplier with proper cold chain handling rather than assuming any fish from the supermarket is appropriate for a raw diet.
Sourcing matters as much as the type of fish itself. Fish that has been properly frozen to manage parasite risk and stored correctly right up until it reaches your dog's bowl is a much safer bet than fish of uncertain origin or handling history.
Building Fish Into a Weekly Routine
Once the initial transition is behind you, many owners settle into feeding fish once or twice a week as part of a broader rotation. This regular but not exclusive approach tends to work well, giving your dog the benefits of fish's nutrient profile without relying on it as the sole protein source. Keeping a simple weekly plan, noting which protein is served on which day, makes the rotation easy to stick to without much ongoing thought.
Getting Support Along the Way
If you are not sure how much fish or other protein your dog needs at any stage of the transition, our meal planner quiz can help calculate a suggested daily portion based on your dog's weight and activity level. Our sample pack is also a good way to trial fish alongside our other proteins in smaller quantities before committing to a full subscription.
The RSPCA recommends introducing any new food gradually and keeping a close eye on your pet during the process, which lines up exactly with the step by step approach outlined here. We are based in Sydney and deliver fresh raw fish and other proteins to households across Australia, so support is always close at hand if you have questions along the way.
Transitioning Puppies Versus Adult Dogs
Puppies and adult dogs can both be introduced to fish, but the pace and portion size differ. Puppies have smaller stomachs and more sensitive digestive systems, so introductions should be even more gradual, with very small amounts trialled first and increased slowly as they grow. Adult dogs with an already settled digestive system from other raw proteins often adjust to fish more quickly, sometimes within just a few days rather than a couple of weeks.
Senior dogs can also benefit from fish being introduced carefully, particularly given the softer texture of well-prepared fish compared to some tougher cuts of meat. As with any life stage, watching your individual dog's response matters more than following a rigid timeline.
Frequently Asked Questions
How do I start introducing raw fish to my dog?
Begin with a small amount of fish mixed into your dog's regular meal, gradually increasing the proportion over one to two weeks while watching how they respond.
How much raw fish should I feed my dog when starting out?
Start with a small taste, around a tablespoon for smaller dogs, before working up to a full portion as part of a balanced meal plan.
Can I mix raw fish with my dog's current kibble?
Yes, mixing a small amount of fish into existing food is a common and gentle way to begin the transition before moving toward a fuller raw diet.
What signs show my dog is adjusting well to raw fish?
Consistent appetite, normal stools and steady energy levels are good signs that your dog is tolerating the new food well.
How often should I feed my dog raw fish during transition?
Once or twice a week is a reasonable starting frequency while your dog adjusts, before working fish into a regular rotation with other proteins.
Should I remove bones before feeding fish to my dog?
Tougher bones should generally be avoided, and smaller, softer bones should only be given under supervision to reduce any choking risk.
What if my dog refuses raw fish at first?
Some dogs need a little more time to adjust to a new texture or smell, so try smaller amounts, different preparation methods or pairing it with a familiar food.
Reviewed by the ardam team.
