How much should my dog eat a day?

Why the right amount matters

More than half of pet dogs are estimated to be overweight, and a big reason is that we feed a bit more than needed every day. Extra weight increases the risk of arthritis, diabetes and breathing problems, and can shorten your dog's life. Underfeeding is a problem too, especially in growing puppies.

What affects how much it needs

• Weight: heavier dogs need more food, but not in direct proportion: a 60 lb dog doesn't eat twice what a 30 lb dog eats.
• Age: puppies need more energy per pound to grow. Seniors usually need less.
• Activity: a working or very active dog can need much more than a calm house dog.
• Spay or neuter: after the surgery, energy needs often drop.
• The food: calories per cup vary a lot between brands.

How to calculate it

Vets often start from the resting energy requirement, calculated from weight, and then multiply by a factor depending on life stage and activity. You don't need to do the math: our daily food calculator does it for you and converts the result into cups and grams. Compare the result with the chart on your food bag and use the lower of the two to start if your dog tends to gain weight.

How many meals a day

Puppies up to six months should eat three or four meals a day. From six months to a year, three. Adults usually do well with two meals, morning and evening. Splitting the portion helps digestion and reduces begging. For large, deep-chested dogs, smaller meals and avoiding intense exercise right after eating may lower the risk of bloat.

Measure, don't guess

Use a measuring cup and level it off, or better yet, weigh the food on a kitchen scale. A cup filled "by eye" can easily contain 20% more food. Remember that treats, chews and table scraps count too: together they shouldn't exceed 10% of daily calories.

How to know if the amount is right

Check your dog's body condition every couple of weeks. You should feel the ribs easily under a thin layer of fat, see a waist from above and a tucked belly from the side. If it's gaining weight, reduce the portion by about 10%. If it's losing weight or always hungry and thin, increase it a little. Our ideal weight tool walks you through it.

Switching foods without upset stomachs

When you change brands or move from puppy to adult food, do it gradually over seven to ten days. Start by mixing about a quarter of the new food with three quarters of the old one, then go half and half, then three quarters new, and finally only the new food. A sudden change often causes diarrhea or vomiting. Remember to recalculate the portion, since calories per cup can be very different.

Feeding tips that help

• Feed at the same times every day: dogs thrive on routine.
• Use a slow feeder or puzzle toy if your dog gulps its food.
• Keep fresh water available at all times.
• Pick up uneaten wet food after 20 to 30 minutes.
• Weigh your dog once a month and write it down to spot trends early.

A sudden loss of appetite lasting more than a day, or eating much more than usual and still losing weight, is a reason to call your vet.

Feeding puppies and seniors

Puppies need food formulated for growth and more frequent meals; large-breed puppies need special puppy food that controls growth speed to protect their joints. Senior dogs often need fewer calories but high-quality protein to maintain muscle. Ask your vet when to switch life-stage foods.

When to ask the vet

Ask for a personalized plan if your dog has a medical condition, is pregnant or nursing, is very old, or gains or loses weight without explanation.

Frequently asked questions

Can I leave food out all day? It's not recommended for most dogs, since many overeat.

Is wet food better than dry? Both can be complete and balanced. Wet food has more water and fewer calories per gram.

My dog always seems hungry. Should I feed more? Not if its weight is good. Many dogs beg out of habit.

This article is for information only and does not replace a visit to your vet.