RESUMEN
BACKGROUND: Canine obesity is the cause of several health issues, and may predispose other diseases, such as orthopaedic disorders, endocrinopathies, metabolic abnormalities and cardiorespiratory disease which can lead to a decreased quality of life and reduced lifespan. Dog are considered overweight when their body weight is ≥15% above their ideal body weight, and as obese when their body weight exceeds 30% of optimal. Prevalence of canine obesity is estimated to be around 5%-20%, and up to 30%-40% when all overweight dogs are considered. Treatment is based on weight loss programmes, focused on caloric restriction associated with exercise. However, success rate of treatment is low. OBJECTIVES: The aim of this study was to investigate the reasons for weight loss failure of obese dogs during treatment with low-calorie diets. METHODS: Records of obese dogs undergoing weight loss programmes between May 2014 and May 2017, assessed by a team specialized in veterinary nutrition, were retrospectively evaluated. Dogs were classified according to weekly weight loss rate (WWLR) (<1%, between 1% and 2%, and more than 2%) and owner compliance with a dietary prescription and physical activity recommendations. RESULTS: The mean WWLR was not satisfactory (<1%) in 64.4% (n = 47/73) of dogs. Regarding owner compliance with the dietary prescription, 44.7% (n = 21/47) of owners did not follow diet prescriptions and physical activity recommendations for their dogs. There was a significant association (p = .01) between compliance of owners and satisfactory weight loss rate; however, there was no association between weight loss success, diet composition sex, reproductive status, age of the dogs and their physical activity (p ≥ .05). CONCLUSIONS: Non-compliance represents a great challenge in the treatment of canine obesity, and may be of more importance than other aspects.