Hope I'm posting this in the right spot.. I adopted an APBT puppy yesterday and I have a 5 year old corgi already living at home. Peanut; the corgi, is pretty territorial when it comes to other dogs coming over if she hasn't met them somewhere away from the house beforehand. I wanted to introduce her to Cooper away from the house at a dog park but because he isn't fully vaccinated we couldn't take the chance. The problem is, as you probably guessed, that Peanut is being aggressive towards him. He is completely submissive and hes only playful. Peanut will snarl, bark and lunge at him if they get face to face. She also follows him around though and when we're walking them together, she'll want to keep sniffing him. What do I do to nip this in the bud while Cooper is still young (11 weeks)?