If this is enough of an issue where it is out of character for your dog then I would take him to the vet pronto. Easpecially in light of the fact he is a geriatric dog. Good luck.

Mine had the same problem and it was a cardio issue. I’d get your baby to a vet pronto. Good luck.

I had the same problem but a dog behaviorist has helped. First I don’t cause the dog to get excited before going out. I just put the leash on and say nothing. If the dog goes nuts just wait a few minutes and go do something else. Take some very favorite treats in your pocket. Every time he lunges call his name. If he looks at you tell him he is good and reward with a treat. If you repeat this action consistently he will respond to you quickly instead of lunging and pulling. I use a regular collar and 6 foot leather leash. If no one is around let him have some slack on the leash to explore. If he pulls I just fold the leash to where it is shorter. If we come upon an aggressive dog I immediately turn my boy around and redirect his focus to me. If you use this method it will work. My guy is 75 lbs. and I am 66. My Jack is a rescue from a hoard and spent 3 yrs in a cage.