If the mix of your dog is correct, he has some herding dog in him (Catahola and amazingly enough, Samoyed). The bitting of the backs of legs is indicitive of a herding dog. Without seeing your dog in action, I cannot say this is what is happening. However, the end result is the same. The dog is bitting. And, herding behaviors are actually a mild form of aggression that left out of control can turn into aggression. These behaviors often pop up between 18 months and 3 years of age.
I suggest you contact a local trainer with experience with herding dogs. They can give you a lot of great suggestions on how to control this. I don't like dealing with aggression issues over the internet as aggressions are very subtle. While this may be a herding form of aggression, it could also be fear aggression. You wouldn't treat the herding aggression the same as the fear aggression. The treatment of one would make the other worse and vice-versa.
So, go find a trainer in your area and get a few private lessons with them. Chances are with just a few lessons, you can get control of this issue. By ignoring it or seeking advice on the internet, the chances are the behavior will get worse.
MACH Aslan RE, MX, MXJ, EAC, EJC, OCC, Wv-N, TN-N, TG-N, R-SN, J-SN, R2-CL, CGC, TDI, FFX-AG (five year old sheltie)
Jericho OA, NAJ, R1-MCL, CGC, FFX-AP (three year old sheltie)
Laika NAJ, CGC (nine year old retired American Eskimo)
I've been defrosted.
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