
Must admit I only tell them the frequency of feeding and advise to feed less than the manufacturers advise by at least a 1/4 to 1/3rd. As they already leave with food and all the supporting feeding advice provided by the maufacturers I don't like to confuse them too much.
I do show them in a beaker how much they are being fed at the time they go and tell them that at most they will tget up to 25% more as they grow dropping down again to adult maintenence levels.
I advise that new owners weigh the food and find a container that takes just the right amount for the daily ration. I then advise that if the dog is getting a tad ribby they can give a heaped measure, and if it is getting a shde plump they can shale a bit off, never getting into a YO yo loss gain situation.