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When weight gain isn't about food
Short answerMost overweight dogs simply eat more than they burn - but not all. Hormonal conditions like hypothyroidism and Cushing's disease can drive weight gain, some medications add pounds, and neutering and aging change calorie needs. If your dog is gaining on measured portions, or a honest diet plan goes nowhere, your vet should look for a medical driver before the calories get cut further.
Sources: VCA Animal Hospitals, linked at the end.
The conditions vets check first
HypothyroidismAn underactive thyroid slows metabolism. Typical companions to weight gain: low energy, a dull or thinning coat, and seeking warmth. Diagnosed with a blood test, treated with daily medication.
Cushing's diseaseThe body makes too much cortisol. Along with weight gain: a pot-bellied shape, ravenous appetite, heavy panting, and drinking and urinating much more than usual.
Medication effectsSome long-term medications, including steroids and certain seizure drugs, increase appetite or alter weight. Never stop a prescribed drug on your own - ask your vet about the options.
Life-stage changesNeutering and aging both reduce calorie needs. A dog fed the same amount through those changes quietly gains, with no disease involved at all.
The clues that point past the bowl
Patterns matter more than any single sign. Weight gain despite honest, measured feeding; gain paired with new thirst, panting, coat changes or low energy; or a slimming plan that produces nothing after weeks of real consistency - each of these earns a vet visit with your weight tracker history in hand. Your vet will usually start with an exam and blood work, which either finds a treatable driver or clears the way for a straight feeding plan with confidence.
What treatment changes
When a condition like hypothyroidism is found and treated, the weight picture often improves alongside it - though portions and treat habits still count. When no medical cause turns up, that's good news: it means the plan in front of you is the right one, and the guides on feeding amounts and safe slimming apply exactly as written.
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