My family & I are having a BBQ this weekend and are introducing my dogs (1 &1/2 yr & 4yr old German Shepherds) & my sister in laws puppy (not to sure the age). My younger GSD has no problem with any dog she loves & is very interested in any animal really so I am not to worried out her. I am worried about my older GSD because he is undersocialized with other dogs.. However not aggressive, but territorial. We want our dogs to get along because we spend alot of time together already and it would be nice to bring our dogs along. So how can we properly introduce them all?