I, also agree with what the vet said. I also tend to agree with leaving the food down. I have found doing that eliminates the dog's belief that they need to gobble everything in front of them any time it is presented because they believe it will be the last they get for a while. Dogs fed this way do not tend to overeat and get fat. Food is taken for granted, not eagerly anticipated (though treats still are!)
I always did this method of feeding with wonderful results for many long years. I have had to change the way I feed around my house, however, because I began to have squabbles over the food. Kaya had gotten to where she guarded the bowls. Now I separate everyone and feed that way now. Otherwise, Kaya scarfs down her smaller portion with twice the speed of Odin and Lad, and then goes and takes theirs from them, or starts a fight trying. I now leave the food for 20 minutes and in the rare event someone doesn't eat it all, I pick it up. However, with Bandit (and also with Pixie when she was alive), I leave the food down 24/7 in his area inside (other dogs have no access) and Pixie always had her bowl down 24/7, too.