Ditch the bowl and calorie math

EnrichmentActivity that meets a dog's behavioral needs, usually through sniffing, chewing, licking, foraging or problem-solving.Read more → can quietly make your dog fat. That's the most common real harm from advice like this, and it's entirely avoidable.

The fix is simple: enrichment food comes out of the daily ration, not on top of it.

Why this is worth the trouble

Being overweight takes time off a dog's life, and the effect is not small. A study of 50,787 middle-aged dogs across roughly 900 North American veterinary practices found that overweight dogs carried a higher risk of death than dogs in normal body condition at every age they looked at, across all twelve breeds studied. The size of the effect ranged from a 35% higher risk in German Shepherds to nearly triple in Yorkshire Terriers.

Separately, a group of Labradors fed 25% less than their littermates from puppyhood lived a median of 1.8 years longer, and their arthritis showed up later.

And here is the hard part: you probably cannot see it on your own dog. When researchers asked owners to score their own dogs' body condition, owners did badly at it. It is not a failure of attention. You see your dog every day, which is exactly why a slow change is invisible. Ask your vet to score your dog and show you what they are feeling for, then use the scale rather than your eye.

Work out your dog's daily calories

Two steps.

Step one, resting energy requirement (RER):

RER = 70 × (body weight in kg)^0.75

For dogs between 2 and 45 kg, this simpler version is close enough:

RER = (30 × body weight in kg) + 70

Step two, multiply by an activity factor to get maintenance energy requirement (MER):

These are the multipliers published in the Merck Veterinary Manual for dogs:

Other multipliers circulate for seniors, working dogs and active weight loss. I've left them out because I couldn't source them to a veterinary reference I trust. If your dog falls outside the categories above, particularly if you're managing an actual weight-loss plan, that's a conversation with your vet, not a formula off a website.

Worked example. A neutered 20 kg (44 lb) adult dog.

• RER = (30 × 20) + 70 = 670 calories
• MER = 670 × 1.6 = 1,072 calories per day
• Treat and enrichment allowance at 10% = about 107 calories per day

These formulas are a starting point, not a prescription. Individual dogs vary by as much as 25% either way. Your vet's number beats a formula, and your dog's body condition score beats both.

The ten percent rule

Treats, chews and anything used for training should stay under 10% of daily calories. The other 90% comes from a complete, balanced food.

That 10% goes fast:

• One six-inch bully stick is roughly 88 calories. For our 44 lb dog, that's 8% of the daily total in one chew.
• A tablespoon of peanut butter is roughly 95 calories.
• Most commercial training treats run 3 to 5 calories each.

How to actually do it

Measure the whole day out in the morning. Get a container. Put the full daily ration of kibble in it. Everything your dog eats that day comes out of that container: puzzle toys, training treats, snuffle mat, scatter feedingThrowing a meal across grass, a rug or another textured surface instead of putting it in a bowl.Read more →, the lot. When the container is empty, the day is done.

Feed most meals through enrichment. There is no nutritional or behavioral reason for a healthy dog to eat from a bowl.

• Breakfast in a snuffle mat or scatter fed
• Dinner in a KONG Wobbler or Bob-A-Lot
• Training treats pulled from the same ration
• Soaked kibble blended into a paste for KONGs and lick mats

When you add a chew, subtract a meal portion. A bully stick day means less dinner. Not the same dinner plus a bully stick.

Use low-calorie fillers. Plain canned pumpkin, green beans, cucumber, plain unsweetened yogurt in small amounts, and plain cooked carrot all bulk out a stuffed toy for very few calories.

Weigh your dog monthly. Most vet clinics let you use their scale for free. Trends beat guesswork, and you cannot reliably see a slow half-pound-a-month gain. A kitchen scale for the food and the vet's scale for the dog are the two measurements this whole page runs on.

A note on the name. The ten percent rule above is about calories, and it is standard veterinary nutrition advice. There is a completely unrelated "ten percent rule" that circulates in dog fitness writing, about increasing exercise by no more than 10% a week. That one has no veterinary evidence behind it: it comes from human distance running. Build a dog's activity up gradually, which is sound, but do not go looking for a number.

Who should not have their bowl taken away

• Dogs with a history of resource guardingBehavior aimed at keeping possession of something valuable, ranging from freezing and eating faster through to growling and snapping.Read more →, unless you're working with a professional
• Dogs at risk of bloat, where fast eating from a wobbling toy may not be advisable: check with your vet
• Dogs on a prescription diet where every gram is measured
• Flat-faced dogs, who can struggle with certain puzzle shapes
• Dogs with dental pain, who need soft food rather than a challenge

Foods never to put in enrichment

Xylitol, which appears in some peanut butters and is often labeled as birch sugar. Onion and garlic, including in stock and broth. Grapes and raisins. Macadamia nuts. Chocolate. Alcohol. Cooked bones of any kind. Anything heavily salted.

Always read the label on broth and peanut butter. Both are common sources of accidental poisoning.