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WEIGHT LOSS

NUTRITION & BODY CONDITION

You've done the BCS. The number confirmed what you suspected. This page walks you through what to do next.

START HERE

Before you change a single thing about your dog's food or exercise, two things need to happen.

Confirm your BCS assessment with your veterinarian before starting a weight loss program.

BCS is a subjective tool — scores can vary between assessors, especially in the BCS 4-6 range where the differences are subtle. Your vet can confirm the score, rule out underlying medical causes of weight gain (hypothyroidism, hyperadrenocorticism, medications), and help you set a realistic target weight. Starting a caloric restriction program on a dog with an undiagnosed thyroid condition won't get you anywhere.

Establish Your Baselines

Before starting, record the following. You'll need them to track progress objectively:

 

  1. Current body weight

  2. Current BCS (confirmed with your vet)'

  3. Calculated target body weight (see the BCS resource page for the formula)

  4. Current daily food amount and brand/caloric density

  • All treats, chews, toppers, supplements, and extras — these add up fast

    5. Current exercise type, frequency, and duration

HOW FAST SHOULD WEIGHT COME OFF?

This is the hard part, going too fast is just as much a problem as going too slow. Aggressive caloric restriction causes muscle loss alongside fat loss, which is the last thing you want in a working or sport dog. 

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The more overweight a dog is (30%+), or depending on other medical conditions, can be indication for aggressive weight loss. These cases should be managed by a veterinarian.

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★ Target Range 1–2% of body weight per week. Preserves muscle mass. Achievable without severe restriction.

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*Note: this is not for cats! See your veterinarian for cat weight loss guidelines*

Step 2 — Calculate a Starting Caloric Target

 

Reduce intake by 10%. This is the amount we can safely decrease without needing to switch to a weight loss specific diet to ensure that all nutritional needs are being met while in a deficit. If your dog's BCS 8/9, talk to your veterinarian for a more aggressive plan. 

We can calculate RER in dogs like in humans, and come up with exact calorie recommendations. I would start with the steps above, and if you are not having success, reach out to your veterinarian for them to do the math for you, to have a target to continue to decrease to. 

THE CALORIC APPROACH

Weight loss comes down to creating a caloric deficit — the dog is consuming fewer calories than they're expending. There are two variables you can move: intake and output. Most successful weight loss programs adjust both.

Step 1 — Know What You're Actually Feeding

Pull the caloric density off the food bag (kcal/cup or kcal/kg). Measure every meal with a kitchen scale or measuring cup — don't eyeball. Then account for every extra: treats, dental chews, training rewards, food toppers, pill pockets. These extras frequently account for 10–30% of daily caloric intake and are almost universally underreported.

Step 3 — Adjust What You're Feeding

You have a few options for reducing caloric intake without leaving your dog feeling underfed:

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  • Reduce portion size of their current food — simplest approach, works well for mild overweight (BCS 6)

  • Switch to a lower-calorie density food— allows the same or larger volume at fewer calories; better for dogs who eat fast or seem unsatisfied; (ex: if you are feeding a sport formula switching to regular adult formula)

  • Add low-calorie volume— plain cooked green beans, cucumber, or similar can bulk out meals without meaningful calories; useful for food-motivated dogs

  • Eliminate extras first— cut all treats, chews, and toppers before adjusting meals; this alone often creates the necessary deficit at BCS 6–7

  • Switch to a veterinary weight management diet— higher protein, higher fiber formulations that better preserve lean mass during restriction; worth discussing with your vet for dogs at BCS 7+

EXERCISE: WHAT CHANGES

Exercise supports weight loss but does not drive it — nutrition is the primary lever. That said, maintaining and building muscle through the process is critical for active dogs, and that requires continued physical conditioning.

Increase Low-Impact Aerobic Activity

Leash walks, swimming, and controlled trotting are your tools here. These burn calories without creating the joint stress that high-impact work adds to an already overloaded frame. Start conservatively and build duration before intensity. An overweight dog has more mechanical stress on their joints with every step than they will at ideal weight, so we recceommend limiting high impact activity like fetch, sports with a lot of jumping, etc. 

An overweight dog is not a candidate for the same training volume as a dog at ideal condition. Excess weight significantly increases load on joints, tendons, and soft tissue with every impact. Before adding conditioning work, be honest about your dog's current fitness base. Walks and swimming first. Build the aerobic base. As weight comes off, progressively reintroduce higher intensity work. Trying to out-exercise a poor diet in an overweight dog often results in injury.

Strength and Conditioning

Appropriate low-impact conditioning work — balance training, cavaletti, controlled hill work — helps preserve and build lean muscle mass during weight loss. For working dogs especially, maintaining neuromuscular function through the process means a faster return to full performance once ideal weight is reached.

MONITORING PROGRESS

Consistent tracking is what separates a weight loss plan that works from one that stalls. You need objective data — not just a feeling that the dog looks thinner.

Weigh Every 1–2 Weeks

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Same scale. Ideally same time of day.

Log it. You're looking for 1–2% of body weight lost per week. If the scale isn't moving after 3 weeks, something in the intake side is off — audit treats and extras first.

Take Monthly Photos

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Same angle, same lighting: overhead and side profile. Progress photos are one of the most underused tracking tools in weight management. Daily variation in posture makes change hard to see in real time — photos make it obvious over weeks.

Reassess BCS Monthly

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The scale tells you weight is changing. BCS tells you what's actually changing. You want fat coming off — not muscle. A dog losing scale weight but whose ribs are still buried in fat may be losing muscle, not fat. Reassess BCS monthly and compare to your starting photos.

Vet Check at 4–6 Weeks

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Schedule a recheck with your vet 4–6 weeks into the program. Confirm weight loss rate is appropriate, reassess BCS together, and adjust the plan if needed. For dogs at BCS 8–9, more frequent vet involvement throughout is recommended.

When the Scale Isn't Moving

If your dog's weight hasn't changed after 3 full weeks of restriction: (1) audit every calorie going in — treats, licks, scraps, toppers; (2) confirm you're measuring food by weight, not volume; (3) reduce daily calories by 10% and recheck in 2 weeks; (4) if still no movement, bring your food log to your vet and rule out metabolic causes.

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