A true terrier, he can be aggressive with other dogs, particularly those of the same sex. Although he's not a sparring dog, if he wants to start a fight or responds to another dog's challenge, it can be a real problem. He's fine with those dogs he's been raised with.

Because he's a hunter, he is not well suited to smaller pets. He may or may not tolerate a cat, but he's definitely bad news around small mammals such as hamsters or rats. To him, they're fast-food snacks. It's hardwired in the Scottie to go after vermin--it's not a choice. Set him up for success by not putting him in a situation where he has to fight his own nature, because he won't.

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