The majority of Labradors in the UK are overweight!
They don't need to be, but they are 'dustbins' when it comes to consuming anything edible and indeed consuming many things that appear not to be edible!!
An overweight Labrador usually continues to be a happy chappie, but the excess weight puts strain on his heart and joints and will certainly shorten his life.
So the solution is entirely in the hands of the owner. You should be able to easily feel his ribs but not see them.
Always feed according to his age, size and exercise regime and use your eye to judge if you are over feeding or indeed underfeeding and adjust the ration accordingly.
Sounds easy I know, but few follow this simple rule, which is a great shame for the breed.
Article: Trimming the Fat