Labradors were originally bred for retrieving waterfowl in ice-cold water, so contrary to what many people and professionals will tell you, a well-bred Lab at a healthy weight will have a thin layer of fat under their skin to insulate them from the elements. It should feel like they are wearing a light sweater underneath their skin. Ribs & backbone should be able to be felt, but not seen. Your well-bred Lab should have a mild amount of uptuck when viewed from the side. From above, there should be a slight waistline to be seen where the ribs meet the loin. While our Labs do tend to be on the stockier side once they are mature, they should NEVER look like overstuffed sausages. Being overweight predisposes dogs to many health issues, including cancer and endocrine disorders.
At maturity (2+ years old), our females tend to weigh around 70-80 pounds, and the males tend to weigh around 80-90 pounds, depending on bone structure, frame size, and whether they are intact. Consult your vet if you think your dog may be overweight!