My other boxer can eat constatnly and never go above 55 pounds.
My dog is definitely underweight by the AKC standard. I think it says Lab bitches should be 21 1/2 to 23 1/2 inches tall and 55-70 pounds. My girl is exactly 21 1/2 inches at the shoulder but only weighs 45 pounds.
She is on the thin side but incredibly powerful and fast - she can easily jump as high as my head and outruns every dog around except the three whippets that live down the street. When they're running together in the big field nearby, she keeps up with them until they hit top gear. Then they just walk away from her, and she looks highly puzzled!
Most Labradors I see are grossly overweight, huffing and puffing and rolling when they run. She can't understand why they won't play with her at her speed - and I do hate to see a fat dog.
Hi Des! My "boys" just love green beans, carrots, celery, broccoli ... even lettuce. They get these "goodies" as a special treat.