Epidemiological surveys performed in clinics and veterinary hospitals estimate the prevalence of canine obesity between 25-35%, while dogs are considered emaciated when they lose a substantial amount of both body fat and muscle tissue, resulting in a body weight that is at least 20 - 25% less than an ideal weight. Therefore, the present study was designed to classify 107 dogs according to their body condition scores; age and health state into four groups and investigate some of their biochemical blood constituents. Clinical examination findings associated with obesity and emaciation were recorded. In the apparently healthy group, old bese dogs showed a significant (p<0.05) increase in alkaline phosphatase enzyme (ALP)
when compared with young ideal and emaciated dogs and old ideal dogs.Random blood sugar level showed significant (p<0.05) decrease in young emaciated dogs in comparable with young obese dogs and old emaciated dogs. While in the diseased group, old emaciated dogs showed a significant (p<0.05) increase in ALP when compared with young ideal, emaciated and obese dogs and old ideal dogs. Random blood sugar level showed significant (p<0.05) increase in young obese dogs in comparable with young ideal and emaciated dogs and old ideal, emaciated and obese dogs. It was concluded that age and body condition score have significant effect on different blood parameters and health state of the dog