i got gracie about 2 months ago and she was only 3 months old she was very skinny and i thought she was being under fed because the guy had her 10 brothers and sisters and her mom dad and two other full grown dobermans. she has gained little weight but in size has trippled. is she not gaining weight because she is growing so fast? and i feed her 2 times a day and she gets a snack in the middle should i be feed her more? please help.