How much to feed a dog starts with the feeding guide on the bag, but that number is only a starting point. The World Small Animal Veterinary Association (WSAVA) says individual dogs can need up to 50% more or less than it suggests. From there you adjust, every two weeks at first, until your dog holds an ideal body condition, which you can learn to check with your hands and eyes.
Here's how to read the bag, how the 9-point body condition score works, where treats fit, and when to bring your vet in. It all follows the WSAVA Global Nutrition Committee's advice for owners. Your vet knows your dog, though, so check with them before big changes, especially for a puppy, a senior or a dog with a health condition.
Why the bag's number is only a starting point
The bag's number is built for an average dog, and your dog isn't average. The WSAVA calls label instructions "a good starting point," based on the expected daily calories for a typical dog of a given weight. That's why the same scoop that keeps one Lab trim can leave the Lab next door hungry, or a bit round.
Individual dogs can vary up to 50% above or below the feeding guide's starting point, according to the WSAVA. Your dog's body, not the bag, has the final say.
There's a second way in. The WSAVA suggests taking your vet's estimate of your dog's daily calorie needs and dividing it by the food's calorie density, like calories per cup or per can. Either method gives you a number to try. Neither gives you the answer.
How much to feed a dog, step by step
Feeding your dog the right amount is a short routine you repeat, not a sum you do once:
- Find the feeding guide on the bag or can and pick the line for your dog's current weight, or their ideal weight if your vet has given you one.
- Check the units. Guides are usually per day, not per meal, so split the daily amount across however many meals you give.
- Measure every time, with a proper measuring cup or, better still, a kitchen scale. A heaped scoop can be far more than a level one.
- Count everything else, because treats, chews and that bit of toast all belong to the day's food.
- Check your dog every two weeks using the body condition score below, and weigh them if you can.
- Adjust in small steps: a little less if they're gaining past ideal, a little more if they're losing or too lean. Then check again in two weeks.
The WSAVA says to keep adjusting every two weeks at first, until your dog reaches and holds an ideal body weight and body condition score.
How to check your dog's body condition score
Body condition is scored on a 9-point scale, and the WSAVA considers 4 to 5 out of 9 ideal. Below 4 is underweight and above 5 is overweight. Your dog's ideal weight is simply whatever weight keeps them at an ideal score.
| Score | What you feel and see |
|---|---|
| 1 to 3 (under ideal) | Ribs easily felt and may be visible with no fat; hip bones prominent; very obvious waist |
| 4 to 5 (ideal) | Ribs easy to feel without excess fat; waist visible behind the ribs from above; belly tucked up from the side |
| 6 (over ideal) | Ribs felt with a slight excess of fat; waist visible from above but not prominent |
| 7 to 9 (over ideal) | Ribs hard to feel under heavy fat; fat over the lower back and tail base; waist and tuck fading or gone |
At home, run your flat hands along your dog's sides. Then look down from above for a waist, and from the side for a tuck. A fluffy coat hides a lot, so trust your hands more than your eyes. Your vet can show you how at the next visit and note the score in your dog's chart.
How many treats fit in a day?
Treats should be no more than about 10% of your dog's daily calories, the WSAVA says. If you're doing a lot of training, take the rewards out of the day's food, or just use some of their regular kibble as rewards.
For low-calorie options, the WSAVA suggests fruits and vegetables, plain rice cakes and plain popcorn. It discourages jerky and dried sweet potato treats, which have been linked to kidney disease in several parts of the world.
And some things are never okay: onions, garlic, chocolate, macadamia nuts, and anything with xylitol, a sweetener that turns up in some sugar-free gum and peanut butters. If you think your dog ate something toxic, call your vet, an emergency clinic or a pet poison line right away.
Free feeding, puppies and switching foods
Leaving food out all day only works for dogs that stay at an ideal weight on their own, according to the WSAVA. It shouldn't be used for dogs prone to weight gain, or for large breed puppies, which need measured meals for a slow rate of growth and a body condition score of about 4 out of 9 to help avoid joint and skeletal problems.
Changing food? Go slowly. The WSAVA suggests switching over at least three days in a healthy dog, and longer for a dog with health problems:
| Stage | Current food | New food |
|---|---|---|
| 1 | 75% | 25% |
| 2 | 50% | 50% |
| 3 | 25% | 75% |
| 4 | 0% | 100% |
A new food almost always has a different calorie density, so a cup of it isn't the same as a cup of the old one. Go back to the new bag's guide and keep checking body condition.
When to ask your vet
Ask your vet to set a calorie target and ideal weight if your dog is a puppy, a senior, pregnant or nursing, very active, overweight, underweight, or has a medical condition. Call sooner if your dog suddenly eats a lot more or a lot less, or loses weight without any change in diet.
Then keep that advice somewhere you'll find it. In the free PetGrid app you can save your dog's records and, if your clinic uses PetGrid, book and message them with a question. Don't have a vet yet? Our guide on how to find a new vet walks you through it.
Questions people ask
How much should I feed my dog a day?
Start with the daily amount on the food bag for your dog's weight, then adjust. The WSAVA says dogs can need up to 50% more or less than the guide, so check body condition every two weeks and change portions in small steps.
Is the feeding guide on dog food accurate?
It's a reasonable starting point, not an exact answer. It's based on an average dog of that weight, and your dog's age, activity and other factors change what they actually need.
How do I know if my dog is a healthy weight?
Check their body condition score. On the WSAVA's 9-point scale, 4 to 5 is ideal: you can feel the ribs without excess fat, and you can see a waist from above and a tucked belly from the side.
How many treats can a dog have a day?
No more than about 10% of your dog's daily calories, according to the WSAVA. Count chews and table scraps too, and trim meals a little on heavy training days.
Should I leave food out for my dog all day?
Only if your dog keeps an ideal weight that way. The WSAVA says free feeding shouldn't be used for dogs prone to weight gain or for large breed puppies.
How should I switch my dog to a new food?
Switch gradually over at least three days, going from a quarter new food to half, then three quarters, then all new. Go slower for a dog with health problems, and ask your vet.
The short version
How much to feed a dog turns out to be a loop rather than a number. Start with the bag, measure properly, count the treats, check body condition every two weeks, and nudge the amount. The WSAVA's ideal is a score of 4 to 5 out of 9, and your vet can help you pick a target for your own dog.
The free PetGrid app keeps your dog's records and your vet's advice in one spot, so the next check-in starts with the right history.
Keep your pet's records, vaccines and visits in one safe place. The PetGrid app is free for pet owners, with or without a clinic.
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