I have two of those dogs. They are in a kennel. Even if i dont walk them, i feed them over 1,5X of what others in the same weight get, they keep looking superb. Nice hard muscles/sexy ass. If you been trying to get her weight up for 8 months and not succeed either the dog has a problem or you are doing something wrong. I think the last :P Just get her feed up more. Might up the fat or and carbohydrates % and i guess she will be fine soon.