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Relationship between the serum concentrations of serotonin and lipids and aggression in dogs

D. Çakirolu, PhD¹, Y. Meral, PhD¹, A. A. Sancak, PhD³ and G. Çifti, DVM²

¹ Department of Internal Diseases, Faculty of Veterinary Medicine, University of Ondokuz Mayis, 55139 Kurupelit, Samsun, Turkey
² Department of Biochemistry, Faculty of Veterinary Medicine, University of Ondokuz Mayis, 55139 Kurupelit, Samsun, Turkey
³ Department of Internal Diseases, Faculty of Veterinary Medicine, University of Ankara, Dskapi, Ankara, Turkey

The serum concentrations of serotonin and lipids - triglycerides, total cholesterol, low density lipoprotein, high density lipoprotein and very low density lipoprotein - were determined in 18 normal dogs and 23 dogs diagnosed as aggressive on the basis of interviews with their owners and an assessment of their behaviour with reference to a canine overt aggression chart. The serum serotonin levels in the aggressive dogs were significantly lower than in the normal dogs (P<0·01), but the differences in serum lipids between the two groups were not statistically significant.