Pinning down the numbers
Begin with specifics. 'A bit overweight' is hard to act on; a current weight, an individual target weight, and a body condition score give you a destination and a way to measure progress. Ask what proportion of body weight the vet wants to change — for many overweight dogs the excess is larger than owners guess, because coats, breed pride, and a neighbourhood of similarly round dogs reset what looks normal. Ask also how the target was chosen for your dog's frame, since breed averages can mislead for crosses and unusually large or small individuals.
Photographs taken from above and from the side, repeated monthly from the same angles, make slow change visible when the scales feel discouraging.
Rate, amount, and the mechanics of change
Ask how fast change should happen. Safe weight loss in dogs is gradual — a steady small percentage of body weight per week or month as the vet sets it — because crash restriction risks muscle loss and misery that ends diets. Then translate the plan into the kitchen: how many grams or measured cups of the actual food, how treats are counted, and whether a therapeutic weight diet would make the ration satisfying enough to sustain. A hungry dog trains his household to feed him; a plan that ignores begging behaviour fails by February whatever the calendar says.
Ask who else feeds the dog to be told the plan, and whether a single daily measured pot would help your household stick to it.
When weight is a symptom, not a habit
Ask directly whether anything medical could be involved. Weight gain with lethargy, coat change, or increased thirst can accompany hormonal disease; weight loss despite a good appetite can reflect dental pain, digestive disease, parasites, or conditions of older age. A vet may suggest blood tests or a dental examination before simply prescribing less food, and a sudden change in either direction in a senior dog should always be investigated rather than dieted away.
Also ask which problems the excess weight is worsening for your dog — arthritic joints, breathing in flat-faced breeds, and cruciate ligament strain are common answers that make the effort feel worthwhile on hard days.
Rechecks and honest reporting
Agree the recheck interval before you leave, and use it: short weigh-in visits are often quick, and a plateau spotted at six weeks can be corrected with a small adjustment instead of discovered at six months. Report honestly what actually happened — the extra feeder, the abandoned plan during a holiday — because the vet can only adjust a plan they know the truth about.
Exercise belongs in the weight conversation, but ask how to build it safely for this dog. A very overweight dog, an arthritic senior, or a flat-faced breed should not be marched up steep slopes on day one; short, frequent, gentle walks that increase gradually protect joints and breathing while the weight comes down. Ask whether hydrotherapy or controlled lead exercise would help, and what signs — lagging, heavy panting, next-day stiffness — mean you have done too much. Pairing the movement plan with the food plan matters, because owners who exercise a dog more often reward him with extra food and quietly cancel the benefit.
Entering every weigh-in, the agreed target, and each adjustment in KinsLe's Pet Passport builds the weight history in one place, so progress — or a worrying drift — is obvious to you and to any vet who sees your dog.