I read that Jack Russell Terriers have a lot of energy. Misha is 4 years old. So far, I am not seeing it. She has spurts of energy. And, on rainy days when she doesn't get her walk, she can be very bratty. But, she isn't the type of dog that runs around all the time that must be walked an hour every day to burn off all the excess energy.
I take her to our family get-togethers. Mostly, she hangs around me or goes to her favorite people. She doesn't really play with the other dogs. Still, she is usually exhausted for 2-3 days afterward.
She has been like this since I got her, so I don't think it's a health issue. I just think she doesn't have the boundless energy I thought her breed would have.
Does your dog have a lot of energy? Are you constantly looking for ways to keep him/her moving?