Our vet has recently advised us that our 3 1/2 year old english mastiff is 40lbs overweight. She is 150lb. She is a purebred. The breeder advised that she would reach 160lb. While our goal isn't to have her reach that 160lb weight, we want her to be healthy. On the other side, she weighed 110lb when she was just 1 year and 7 months. She was still a puppy and very very skinny at that weight. We think that is an extreme weight loss goal. We can feel her ribs, but we think she can stand to lose a little bit of weight. We control her food by weighing and measuring it and we buy an expensive brand. She gets regular exercise and is well cared for. Our concern is mainly with a "goal" weight. How do you determine that, and how can our vet have determined such an extreme loss? Should she have stopped filling our at 1 1/2 years old? There are recent pictures of her on our IG account Heavysaintmastiff. She is black brindle. Any help would be greatly appreciated!