This is Mack. He's a young and very excitable fox terrier miniature poodle mix. He loves to chase balls. So much so that he has developed a very insistent bark whenever the ball is out. Here's how we're working to modify this behaviour...

Here's an example of how we first start working and changing behaviour with dogs that have a history of not liking each other.

Here's how we introduced Poodle to a dog he's not met before, Murphy.