Dog Weight Loss Plan: Calories and Pace

Quick answer A safe dog weight loss pace is about 1 to 2% of body weight per week. Feed the calories for the goal weight, which is 1.0 times the resting energy requirement (70 × kg^0.75). A 30 kg dog with a 25 kg goal gets about 783 kcal a day and needs roughly 10 to 19 weeks.

Most dogs that need to lose weight do not need a dramatic diet. They need a clear goal, a calorie budget that is based on that goal, a way of measuring every meal, and a vet who checks the plan along the way. This guide walks through each step of a dog weight loss plan: choosing the target weight, working out the calories for a dog to lose weight, picking a safe pace, weighing the food, handling treats, and knowing what to do when progress stalls.

Why the plan starts with a goal weight

The most common mistake is feeding “a bit less” without a number to aim for. A goal weight gives every other figure in the plan something to be calculated from. There are two practical ways to find it:

Ask your vet. They can examine your dog, score body condition and name a target.
Use the body condition score. On the 9-point WSAVA scale, 4 to 5 is ideal and each point above 5 is roughly 10% over ideal (Laflamme 1997). A dog that weighs 30 kg and scores 7 is about 20% over, which points to a goal near 25 kg. Our dog body condition score chart guide shows how to score a dog at home, and the Dog Body Condition Score Calculator does the arithmetic.

Write the goal down with a date. A goal that only exists in your head tends to drift.

The calorie budget: feed for the weight you want

The standard approach in the veterinary literature is to feed the calories of the goal weight, not the current weight. The resting energy requirement (RER) is:

RER (kcal/day) = 70 × goal weight in kg ^ 0.75

For weight loss the factor used in the Dog Weight Loss Calculator is 1.0 × RER of the ideal weight, a figure consistent with the Merck and WSAVA guidance. A 30 kg dog with a goal of 25 kg therefore starts at about 783 kcal a day. For comparison, the same dog at 30 kg, neutered, would normally eat about 1,436 kcal (1.6 × RER), so the weight loss budget is roughly 55% of its usual intake.

Current weight	Goal weight	Weight loss calories (kcal/day)	Weeks at 1% a week	Weeks at 2% a week
12 kg	10 kg	394	19	10
20 kg	16 kg	560	23	12
30 kg	25 kg	783	19	10
40 kg	32 kg	942	23	12
50 kg	40 kg	1,113	23	12

These numbers are a starting point. The Dog Weight Loss Calculator works them out for any current and goal weight, and your vet will adjust the budget after the first weigh-ins.

Turning calories into grams

Calories are only useful once they become food in a bowl. Read the kcal per kg (or kcal per cup) on the bag, then divide:

grams per day = calories ÷ (kcal per kg ÷ 1,000)

A food that lists 3,600 kcal/kg has 3.6 kcal per gram, so 783 kcal is about 217 g a day, split over two or three meals. A 20 kg dog with a goal of 16 kg on the same food gets 560 kcal, about 156 g. Use the Dog Food Calculator for the grams and, if you prefer cups, convert with the kcal per cup printed on the label. Cups are a loose measure, which is why a kitchen scale is worth buying for this job. Our guide to how much to feed a dog covers the label arithmetic in more detail.

If you change the food, recalculate. A different food has a different energy density, so the same grams can mean a very different calorie intake.

How fast is safe? The 1 to 2% rule

AAHA’s weight management guidelines describe a safe loss of about 1 to 2% of body weight per week. For a 30 kg dog that is 300 to 600 g a week. A slower pace is perfectly acceptable, and your vet may prefer it for older dogs or dogs with other health problems. A faster pace is not “better”: it risks losing muscle and can leave a dog hungry and difficult to feed.

The weeks in the table above come from compounding that percentage until the dog reaches the goal. Two cautions apply:

Real weight loss is not a straight line. Water, food in the gut and measurement error all move the scale by a few hundred grams.
Slower progress at the end is common, because the calorie budget for a lighter dog is also smaller.

The Pet Weight Goal Date Calculator turns a goal weight and a weekly rate into a target date, which makes the plan easier to keep in view.

Weigh, measure and record

A plan fails quietly when nobody is sure how much the dog is actually eating. Four habits fix that:

Weigh the food with a kitchen scale for the first few weeks, then spot-check.
Use one measuring method for every household member. Ask everyone in the home to feed from the same pre-weighed portions.
Weigh the dog every one to two weeks on the same scale at the same time of day. Small dogs can be weighed by stepping on a scale with and without them in your arms.
Write it down. A simple table with the date, weight and any notes is enough; the Pet Weight Change Calculator shows the percentage change and the weekly pace.

Week	Date	Weight	Change since last	Notes
0				Starting weight, body condition score
2				First vet or nurse check
4				Adjust portions if the pace is off
6

Treats, chews and the 10% rule

Treats are the usual reason a plan stalls. WSAVA and AAHA guidance caps treats at 10% of daily calories. On a 783 kcal budget that is about 78 kcal, which is only a few small biscuits. Treats also need to come out of the daily total, not on top of it. Practical ways to keep them under control:

Use a portion of the dog’s own kibble as a reward.
Cut treats into pea-sized pieces.
Count chews, dental sticks and anything used to hide a tablet.
Ask visitors and children to hand over treats only from a measured jar.

The Dog Treat Calorie Calculator shows how many treats of a given calorie size fit in the allowance.

Exercise: helpful, but not a substitute for the budget

Walking and play improve fitness, mood and muscle, and they help a dog keep weight off once it is lost. They rarely burn enough to replace a calorie budget, because a dog’s daily energy use is small compared with how easily it can eat extra. Build up gradually, avoid hard exercise in hot weather and ask your vet what suits your dog’s joints and heart. Overweight dogs are often stiff, and swimming or short, frequent walks are usually easier than one long outing.

When weight loss stalls

If the scale stops moving for three or four weeks, work through this checklist before changing anything:

Is the scale still accurate and used the same way?
Are the portions still weighed, or have they drifted back to scoops?
Have treats, table scraps or “just a little” extras crept back in?
Has a family member started feeding without telling the others?
Has the dog’s food changed brand or type?

If all of those are fine, talk to your vet. Some medical conditions make weight loss harder, and a vet can check for them and may adjust the plan or the food. Do not drop calories sharply on your own.

Signs to call the vet

Contact your vet if your dog:

Is losing weight faster than the planned pace.
Seems unusually tired, weak or lethargic.
Stops eating or becomes very hungry and persistently scavenges.
Is drinking noticeably more than usual.
Has any sudden change in behaviour or mobility.

Keeping the weight off

Reaching the goal is only half the job. After the last weigh-in, the calorie budget rises gradually towards the maintenance level for the new weight, and your vet will suggest how. A sensible maintenance routine looks like this:

Keep weighing every month.
Keep scoring body condition so you notice early drift.
Keep treats inside the allowance.
Use the Dog Calorie Calculator with the new weight, and read our guide to dog calories to see how the factor changes.

A worked example, week by week

Seeing the plan on a calendar makes it less abstract. Take a neutered 30 kg dog with a goal of 25 kg.

Step	What happens	Number
Day 1	Vet confirms goal weight and starting plan	25 kg goal
Day 1	Calorie budget at 1.0 × RER of 25 kg	about 783 kcal a day
Day 1	Food label says 3,600 kcal/kg	about 217 g a day, two meals
Day 1	Treat allowance at 10%	about 78 kcal a day
Week 2	First weigh-in	Expect a small drop; do not change anything yet
Weeks 4 to 6	Check the pace	1% a week is 300 g, 2% a week is 600 g
Week 10 to 19	Goal reached, depending on pace	25 kg

Notice that nothing in the table depends on willpower or guesswork. Each line follows from the line above it, and any line that does not match reality is the place to look when progress is slow.

Special situations

Older dogs. Senior dogs often carry extra weight and have stiff joints, so weight loss can help them move more comfortably. They may also have other conditions that change the plan, which is a good reason to involve your vet from the start rather than after a few weeks.

Several dogs in one home. Feed separately, or feed the dog on a plan out of reach of the others. Many weight plans fail because a lean housemate’s bowl is available.

Dogs that beg. Hunger signals are often habit and boredom as much as hunger. Splitting the daily amount into three or four smaller meals, using slow feeders or puzzle toys and adding a short walk before mealtimes can help. Do not reward begging with extra food.

Dogs on medication or with a health condition. Never change a prescribed diet without your vet. Weight management is still important, but it has to fit the treatment.

Common myths about dog diets

“A little extra won’t matter.” On a budget of about 783 kcal, one large biscuit or a piece of cheese can be a noticeable share of the day.
“My dog is big-boned.” Bone structure varies, but the body condition score looks at ribs, waist and tummy tuck, not frame size.
“He looks happy, so he must be fine.” A happy dog can still carry a weight that strains joints; look at the score, not the mood.
“Crash diets work faster.” They can, but they risk muscle loss and are harder to stick to than a steady 1 to 2% a week.
“Exercise alone will fix it.” Exercise helps, but food measurement is the lever that moves weight most reliably.

Quick summary

Set a goal weight with your vet, or use body condition score (about 10% over ideal per point above 5).
Feed 1.0 × RER of the goal weight: 70 × goal kg ^ 0.75 kcal a day.
Aim for 1 to 2% of body weight lost per week, never faster.
Weigh the food, weigh the dog and write both down.
Keep treats within 10% of daily calories and inside the same budget.
If progress stalls, check the basics first and then ask your vet. Use the Dog Weight Loss Calculator for your own numbers.

Frequently asked questions

How fast should a dog lose weight?

AAHA guidance puts a safe pace at about 1 to 2% of body weight per week. Faster loss is not safer, and your vet may choose a slower pace for your dog.

How many calories should an overweight dog eat?

A common starting point is 1.0 times the resting energy requirement of the goal weight, which is 70 × goal weight in kg to the power 0.75. Your vet then adjusts it from the scale and body condition.

How do I know my dog's goal weight?

Use the body condition score. Each point above 5 on the 9-point scale is roughly 10% over ideal, so a score of 7 suggests about 20% extra weight. Your vet can confirm the target.

How long will my dog take to reach goal weight?

At 1% a week a 30 kg dog going to 25 kg needs about 19 weeks, and at 2% a week about 10 weeks. Real progress is uneven, so treat it as a range.

Can I just feed less of the same food?

Sometimes, but cutting portions of an ordinary diet can leave a dog short of nutrients. Ask your vet whether a weight management food is a better choice.

What if my dog stops losing weight?

Re-weigh, re-measure the food and count every treat. If the scale is stuck for several weeks, ask your vet to review the plan and rule out a medical cause.

Do treats count during weight loss?

Yes. Treats should stay within 10% of the daily calories, and during weight loss they come out of the same small budget as meals.

Sources

AAHA (2014) Weight Management Guidelines for Dogs and Cats
WSAVA Global Nutrition Guidelines (incl. 9-point BCS charts)
NRC (2006) Nutrient Requirements of Dogs and Cats, National Academies Press
Laflamme D. (1997) Development and validation of a body condition score system for dogs. Canine Practice

Reviewed by the CalcuPaw Veterinary Review Team

Last reviewed 18 Oct 2026 · Meet the review team · This guide is general information, not veterinary advice.