The number printed on the bag is a population average for a dog that does not exist. Your dog has his own metabolism, activity level and neuter status, and the only reliable way to portion his food is to feed him and then look at him.
I am not a vet. This is the method I use, and the two-minute check that replaced my guessing.
Body condition beats the feeding guide
Feeding guides are a starting point and nothing more. Two dogs of the same weight can need meaningfully different amounts, and a neutered dog often needs less than the bag suggests.
Use your hands weekly instead. Run them along the ribs: you want to feel them easily under a thin layer of covering, the way you feel the knuckles on the back of your hand. Look from above for a waist behind the ribs. Look from the side for a tuck up toward the back legs.
If the ribs are hard to find, reduce slightly. If they feel sharp with nothing over them, increase slightly. Then leave it a month before judging, because weight moves slowly in both directions.
Why this matters more than it sounds
Extra weight is not cosmetic. The AVMA states that “Obesity in senior pets is linked to an increased risk of arthritis, difficulty breathing, insulin resistance or diabetes, heart disease, high blood pressure, skin problems, cancer, and other conditions.”
The loop is the problem. A heavier dog moves less because moving is less comfortable, and moving less puts on more weight. It closes quietly over a year or two and gets experienced as a dog slowing down with age.
Catching it early is far easier than reversing it, which is the whole argument for the weekly hands-on check.
A workable feeding day
Times matter less than consistency. Pick times you can keep on a bad week.
| When | What | Why |
|---|---|---|
| Morning | Half the daily ration | Predictability settles dogs more than the food itself |
| During the day | Training treats, counted into the total | Extras are the most common cause of quiet weight gain |
| Evening | The other half, ideally from a mat or puzzle | Working for food settles a restless dog |
| After exercise | Wait a while before feeding | Especially for large, deep-chested breeds |
| Weekly | Hands on the ribs, same day each week | You will not notice gradual change any other way |
| Monthly | Adjust the portion, in small steps | Judging sooner than a month tells you nothing |
How often to feed
Two meals a day suits most adult dogs. Puppies need more frequent, smaller meals, and the schedule changes as they grow, which is a question for your vet about your particular puppy.
Free feeding, leaving food down all day, removes your best early warning. A dog who goes off his food is telling you something, and you cannot notice that if you never see an empty or full bowl at a known time.
For large, deep-chested breeds, splitting into two or three smaller meals rather than one large one is the common advice, alongside not feeding immediately around hard exercise. Our article on feeding problems worth watching for covers bloat, which is the reason.
Measure with something consistent. A mug from the cupboard is not a measure, and the difference between a heaped and a level scoop can be a meaningful share of a small dog’s day. Use the scoop the manufacturer specifies, a proper measuring cup, or kitchen scales, which are the most accurate of the three.
Scales matter most for small dogs, where a modest error is a large proportion of the daily total. For a five-kilo dog, being generous twice a day adds up to a real weight change across a few months.
Count the treats, honestly
This is where most portioning falls apart. Training treats, dental chews, the crust from a child’s toast, a lick of yoghurt, and whatever the neighbour hands over the fence.
The FDA makes the nutritional half of the point: treats and supplements “are typically not intended to be a pet’s sole diet, so these products are often not complete and balanced.” Feed enough of them alongside a complete food and the overall diet stops being complete.
The fix is arithmetic, not willpower. Measure the daily ration into a container each morning and take training rewards from it. When the container is empty, the day is done.
Getting portions right
- Start from the bag’s guide, then adjust to the dog
- Measure with a proper cup or scales, not by eye
- Portion the whole day out in the morning, treats included
- Two meals at fixed times for most adult dogs
- Hands on the ribs weekly, the same day each week
- Change amounts in small steps and wait a month
- Re-check the portion whenever you change food, since calorie density differs
When the amount needs to change
After neutering, many dogs need less. After a change in activity, in either direction. In winter for some dogs and summer for others. As a dog reaches middle age and slows down. And every time you switch foods, because a cup of one food is not a cup of another.
Our guide to when and how to switch dog foods covers the transition, and it is worth re-checking the portion a month after any change.
Book an appointment rather than adjusting portions further if your dog:
- Is losing weight without you reducing food
- Is gaining despite a sensible portion
- Is suddenly ravenous, or has gone off food entirely
- Is drinking noticeably more than usual
- Has a condition affecting diet: kidney disease, pancreatitis, diabetes
A weight loss plan is worth doing with your vet rather than by eye, because cutting food hard causes its own problems. Ask them to show you how to assess body condition on your own dog once, in person. It takes two minutes and you will use it weekly for years.
What good looks like
Ribs easy to feel, a visible waist, steady weight month to month, and a dog who eats his meals within a reasonable window without negotiation.
Not an empty bowl in ten seconds, and not a dog who has to be coaxed. Both of those are worth looking at, and our article on fixing a picky eater covers the second.
Do the check tonight. Hands on the ribs, and be honest about what you feel.