I like to keep my bullies on the lean side. Hasn't made rudy's breeder very happy, but he didn't get the limp his, 10 pound heavier, overweight brother did. He loves to run around the yard and doesn't get winded when I walk him. Mila is lean and mean, probably more athletic than Mimi RIP. Our vet used to bring other bulldogs owners into the room to show Mimi to them to see what a healthy bulldog should look like. Mimi used to run back an forth full speed for 30 to 60 minutes, playing with the dog on the other side of the fence, at 10 years old. Follow your gut. If your bulldog is lethargic he may be eating too much. The true balance for us was somewhere between the vet (his opinion is they should go at their food like they are starving to death) and the breeder (feed them until they are full, like a bulldog is ever full). Feed them good food, watch the energy level and feel for ribs not RIB.