I have to tell you the Havanese love to chase the squirrels. Wasabi can even catch one but what does she do if she does? She lets it go. It's simply the fun of the game. Kat just loves to look.
Shoshi used to be our top duck chaser, squirrel hunter with Risa not too far behind. They do adore a game of chase.
What does that tell you? If you ever have a dog loose that is heading the wrong way and he/she won't come to you, run the other way. Get her/his attention and run and the chase will be on and the dawg will come to you. It sounds counter productive but it does work.
We were at a gas station one time and a dog got out of the car and was running towards the road. The owner was frantic. Nathan stepped into action and the dog was chasing him away from the street till the dog got close to the owner where she could catch him.
Remember, take advantage of their natural desire to chase. Be creative. Play games and get that recall down as it could save their life.