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Objective: To characterise lipid profile in dogs with tail chasing.

Methods: Fifteen dogs with tail chasing were included in this study. A behavioural diagnosis was made for each dog on the basis of the dog’s behavioural history, clinical signs and results of other medical assessments. None of the dogs had concurrent medical disease that would account for compulsive tail chasing. Blood samples were taken from each dog after a fasting period of 12 to 16 hours to measure total cholesterol, triglyceride, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol and very low-density lipoprotein cholesterol levels. Fifteen control dogs were also enrolled on the basis of normal physical examination results, complete blood count and serum biochemistry profiles.

Results: Dogs with tail chasing had significantly higher total cholesterol (P<0·01), high-density lipoprotein cholesterol (P<0·05) and low-density lipoprotein cholesterol (P<0·001) compared with control dogs. Very low-density lipoprotein cholesterol and triglyceride levels did not differ significantly between the groups.

Clinical Significance: Tail chasing may be associated with serum cholesterol elevations in dogs. High serum cholesterol, high-density lipoprotein cholesterol and low-density lipoprotein cholesterol levels may be used as biochemical parameters of compulsive tail chasing in clinical settings.