Katiejm123

We have an Old English sheepdog who will be 3 years old on Aug 1. When he was a puppy we had no difficulties with him going in the vehicles- very calm and quiet. For the last year and a bit, whenever he gets into our vehicles he barks and barks and won't settle. Road trips have become a nightmare- he'll settle for maybe 30 seconds then start with the barking again. We have no idea what has caused this change in behavior; whether it's dominance, aggression, fear- we're stumped. Anyone have the same problem with their beloved canine?
Kate