A Russian Blue is slightly larger than the average house cat, so a healthy weight for an adult male would be in the range of 10 to 12 pounds (4.5 to 5.5Kg). Anything above 15 pounds (7Kg) is overweight.
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The physical characteristics of the Russian Blue cat breed are a silver-blue coat, two layers of short thick fur and bright green eyes. Some behavioral characteristics are that they are quite curious, intelligent and friendly.
My Russian Blue cat is about 9 months old, and is two and a half feet from nose to tail.
I have a male Russian blue and he weighs in at 18.4 lbs and fairly long. They should normally weigh about 12 lbs when they are adults. Mine is fairly over weight too.