I have three Westies. They are all in the 7-9 month range. We live in the woods where there are lots of squirrels to chase and it's almost impossible to control them when they are all out at the same time because they just egg each other on with chasing things. I'm terrified I'll lose one or more of them and I don't have time to take them all out individualy every morning and evening. They listen fairly well when they are on thier own. Please help!!!!