Yes. We cut back the food 1/3 as per vet and reduced snacks to dog treats. Increased exercise somewhat as he had hip problems from being too big and malnourished as a puppy before I picked him up in the woods. He lost from 105 to 80 lbs. Hip problems are much better but still a problem to watch. Swimming is great for them and ours loves the water.
From your pics I also suspect thyroid or other issues. I was shocked to see the change from before.
Big size

Slim mode
