We have a male JRT. He's 10 and entire. When we got him as a pup we already had a female collie and he grew up happily with her. She died a few years back. Now we are adopting a young female collie (already spayed). JRT is confrontational with other dominant males but is normally OK with females (plays with them) but he has taken a dislike to a friend's female lab, which worries me a bit - a lot of growling and we think they'd fight. She is dominant, though, and our new collie seems to be a nervous type who will not challenge JRT's place as head of the pack. What we're wondering is if DH should take the JRT away for a few days so new collie can get used to the house? But she'll smell the JRT. The collie is going to have a fenced-off run outside to herself at first (daytime). But how would you handle the introduction? The last thing we want is for the JRT to feel someone is invading his patch.