Small dog or large breed: how to choose the right kibble size and formula?

Your dog's adult size directly affects the right kibble to choose: a small dog has higher energy needs per kilo and a smaller jaw, while a large dog needs better-controlled growth and formulas designed for their adult weight. It is better to choose a size-specific range rather than a generic "all sizes" kibble.

1. Why size changes nutritional needs

A small dog, say under 10 kg, has a proportionally faster metabolism than a large dog: they burn more energy per kilo of body weight, which is why "small breed" formulas are often more energy-dense. A large dog, conversely, grows more slowly but reaches a much higher adult weight, which requires particular attention to the calcium and phosphorus balance during growth, so as not to overstress the developing skeleton.

Kibble size itself is also designed with the jaw in mind: a tiny piece would be swallowed almost without chewing by a large dog, while a large piece could be hard to eat for a chihuahua or a yorkshire terrier.

2. Size guidelines, for information only

Category	Indicative adult weight	Indicative end of growth
Small breed	under 10 kg	around 10-12 months
Medium breed	10 to 25 kg	around 12-15 months
Large breed	over 25 kg	around 15-18 months
Giant breed	over 45 kg	around 18-24 months

3. Formulas to favour by size

For a puppy:

• ACANA Puppy Small Breed, for small-breed puppies.
• ACANA Puppy Large Breed, for large-breed puppies.

For an adult dog:

• ACANA Adult Small Breed, for small-breed adult dogs.
• LUPUS EXPERT Adult+ large breed, with chicken, for large and giant breeds.

To compare all available formulas, see our small dog kibble and medium and large dog kibble collections.

4. How to estimate a puppy's adult weight

If you adopted a puppy of a known breed, the breed's average adult weight gives a good indication. For a mixed-breed puppy or one of unknown origin, a veterinarian can estimate an adult weight range by looking at paw and bone size during the first visits. This estimate remains indicative and can change over the months, which is why it is worth reassessing the formula and portion regularly rather than relying on a single initial estimate.

5. Kibble shape in everyday life

• Kibble that is too small for a large dog can be swallowed too fast, without being chewed enough.
• Kibble that is too large for a small dog can be hard to grasp and chew properly.
• If you have several dogs of different sizes at home, use separate bowls to stop one dog eating another's ration.
• An anti-gulping bowl can slow down a dog who tends to swallow too fast, whatever their size.

6. Small breeds: specific points to watch

Small breeds often have a fast metabolism and a proportionally smaller stomach, which makes them more sensitive to irregular meals than large breeds. Splitting the ration into several small meals during the day, rather than one or two large meals, suits many small dogs well. Since their life expectancy is generally longer than large breeds', they also spend proportionally more time as adult dogs before entering the senior category, leaving more room to fine-tune the kibble choice gradually over the years.

7. Large breeds: specific points to watch

In large and giant breeds, the growth period is the most sensitive stage: gaining weight too fast during this phase can put more stress on the joints than a more gradual growth. This is why "large breed" puppy formulas are generally less energy-dense than standard formulas, to slightly slow down growth speed without depriving the puppy of needed nutrients. Once growth is complete, large dogs also tend to age earlier, which shortens the "adult" period before switching to a senior formula, as seen in our article which kibble is best for a senior dog.

8. Signs that should prompt a vet visit

Growth that seems abnormally fast or slow compared to the expected curve for the breed, limping or difficulty moving should be examined by a veterinarian, particularly in large-breed puppies during their growth period. These are topics beyond the dietary choice covered in this article.

9. In short

Choosing the right kibble size and formula for your dog means accounting for their expected adult weight, at every stage of their life. Our articles how to choose your puppy's kibble and how much kibble for a dog usefully complement these size guidelines. When in doubt, your dog's estimated adult size and current weight remain better guides than age alone.

Need help choosing the right kibble size? Take our 2-minute quiz: find the right kibble.