I haven't had to post in a long while. Any questions I had I could just search the site and I was all set. But I have a question I cant find the answer to. My buddy brought over his 9 week old male mastiff today so he could meet tyson, who's 3yrs. They were smelling each other and all of a sudden tyson got angry and jumped on the pup. I pulled tyson off and seperated them until my buddy left. I thought tyson would know it's a puppy and be nice to him. Should I have put ty on his leash then introduce them? not sure what happened or what I should do next time. thanks for any advice.