Hybrid wolves are generally more aggressive in the first three generations. Although hybrid wolves are a cross between gray wolves and wild dogs, they still have strong wolf characteristics. Not only can they howl, but they are also extremely aggressive towards people. There have been many attacks by hybrid wolves that prey on children and livestock in some states in the United States. Therefore, local laws stipulate that if you want to raise hybrid wolves, you must isolate them for five generations, and relevant certificates will be issued. Therefore, we need to pay special attention to the "Czech wolfdogs" imported into the country without certificates. They are likely to be counterfeit mixed-blood wolves by merchants. You must pay more attention when purchasing.