Does he also get treats and snacks?
How much food you give will vary depending upon the brand, the fat and protein content, ect.
There are many variables.
If the food is high in protien/fat (30% in that area), then that is probably enough. If you are feeding a high protein, I would suggest you stop during the growth stage, (which I think is from 13 weeks to one year). Too much protein is hard on the growth of bulldogs. Stick with a food that is around 26% protien and high in fat content.
Lisa does the feeding so I am not sure how much we give.