I consider a large breed dog, lab, great dane, Akita's, boxers, grey hounds, anything that weighs more than 50lbs is considered a large dog. Large breeds can be husky's, newfulands(i believe that is how is spelled).
I have Akita weighs 110 lbs. and at the age of 5 months he weighed 50 lbs. My vet told me to start feeding him adult food due to his size, type of dog he is, and because he is growing he needs the adult food nutrients. My black lab/german shepard mix weighs 42 lbs. My vet told me the same thing at a year old feed her adult food. Both of my dogs are 16 months old.
Neither of my dogs are over weight. Great post