Any advice gratefully received:
RabbitDog is a newly adoptetd (Easter) rescue black lab x collie. When off lead and chased by other dogs not under good owner control he bolts. Once for home, crosing busy roads on his own so a real danger, and once on an unfamiliar walk off to the nearest village.
Other than this he is lovely - he can take or leave unknown dogs, doesn't tend to go near them, is a ball freak so stays on lead when children are playing in the park.
Has reliable sit, stay, come, down and drop at home and in the park.
What should we be working on to help him overcome his extreme panic and keep him and others safe?