The obese dog that stops losing weight: what to do
6-year-old neutered female Beagle, body condition score 8/9, on a weight-loss plan with a dedicated diet. In the first month she lost 1.5% per week, but her weight has not changed over the last 6 weeks. The family say they are following the diet, and blood tests, including thyroid function, are normal.
What is the most appropriate next step?
chevron_right Show answer and explanation
A. Use a diary to review everything she eats and who feeds her, check that the ration is weighed on scales and, if everything is correct, reduce the ration by about 10%
Correct. Plateaus are common: energy requirements fall as the dog loses weight, and there are often hidden calories (treats, scraps, other pets' food). Adjust the ration and recheck in 2–4 weeks.
B. Empirical levothyroxine to speed up metabolism
With normal thyroid function, levothyroxine is not indicated and may cause iatrogenic thyrotoxicosis. The problem is energy balance, not the thyroid.
C. Add one fasting day per week
Fasting increases hunger and food-seeking behaviour, worsens compliance and does not ensure essential nutrient intake. Restriction should be daily and controlled.
D. End the plan and accept her current weight
With a body condition score that is still high, a plateau is a reason to adjust the plan, not abandon it. Excess weight continues to reduce her quality of life and life expectancy.
lightbulb Key takeaway
Involve the whole family, weigh the food and deduct treats from the ration (no more than 10% of calories). Recalculate the ration at each check-up: a dog that weighs less needs less energy.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.