Weight Management Guide

Cause ① Excess Calorie Intake (Miscalculating Total Intake Including Treats)

• ✓Lund et al. (2006): approximately 34% of adult dogs in North America are overweight or obese. Obesity is directly linked to arthritis, diabetes, heart disease, and shortened lifespan. German (2006): obese dogs die an average of 2.5 years earlier than dogs at a healthy weight.
• ✓The most common cause of excess calorie intake is failing to count treat calories in the daily total. If treats account for more than 10% of daily calories, weight gain accelerates. Example: a 10 kg adult dog's daily calorie target is approximately 550–680 kcal, but treats alone can easily exceed 200 kcal.
• ✓Feeding guides on packaging are often calculated for intact (un-neutered) adult dogs. After neutering, MER (Maintenance Energy Requirement) decreases by approximately 15–25% (NRC 2006) — feeding amounts must be recalibrated after the procedure.
• ✓Free-feeding (leaving food out all day) increases the risk of overeating. Two measured meals at set times per day (portion-controlled feeding) is more effective for weight management.

Cause ② Misunderstanding BCS & the Absence of an Ideal Weight Benchmark

• ✓BCS (Body Condition Score) uses a 1–9 scale (WSAVA 2013), with 4–5 being ideal. Score 4–5: ribs easily felt, visible waist from above / Score 6–7: fat layer over ribs, indistinct waist / Score 8–9: ribs cannot be felt, clear abdominal distension.
• ✓Many owners perceive their dog as 'normal' when the dog is already overweight (BCS 6–7). Owners of overweight dogs often describe healthy-weight dogs as 'too thin' (German 2006). Monthly BCS self-assessment is an important habit to develop.
• ✓Underweight (BCS 1–3) is characterized by prominent ribs, spine, and pelvis, with clear muscle loss. Beyond simple calorie deficiency, it can signal parasite infestation, malabsorption syndrome, or underlying disease.
• ✓BCS is a more accurate indicator than weight alone. Two dogs of the same weight can have very different BCS scores depending on muscle versus fat composition.

Cause ③ Underlying Disease (Thyroid, Adrenal & Other Endocrine Issues)

• ✓If weight cannot be controlled with diet and exercise adjustments, underlying disease should be suspected. Hypothyroidism is the most common endocrine disease in dogs — decreased thyroid hormone production leads to reduced metabolic rate, weight gain, lethargy, and bilateral symmetric alopecia.
• ✓Hyperadrenocorticism (Cushing's syndrome) causes cortisol excess, leading to abdominal distension, increased thirst and urination, muscle wasting, and obesity. In these cases, calorie restriction alone will not result in weight loss.
• ✓Underlying causes of underweight include chronic kidney disease, inflammatory bowel disease (IBD), and exocrine pancreatic insufficiency (EPI — insufficient digestive enzyme secretion). EPI presents with weight loss despite high calorie intake, accompanied by steatorrhea and diarrhea.
• ✓If a 6-month diet is ineffective, or if unexplained weight gain or loss occurs, ask your vet for thyroid (T4), blood glucose, and adrenal hormone testing.