Hi, please feed curd as it's good for digestion. Please stop feeding milk as dogs don't have enzymes to digest lactose. You may have notices your dog is giving loose stools. This is because he's not able to digest milk. You can feed items like boiled egg ( not more than one ), minced chicken with rice. Boiled vegetables mixed with rice, paneer, etc.
If you are keeping her on home-diet, it's fine but give him calcium and vitamins supplement because home-cooked food may not be able to meet all the requirements of dog food.
I kept my Labrador on commercial diet for first 6 months to ensure there is no deficiency in the nutrition. After 6 months, we gradually introduced home-diet. Labrador can gain weight very easily which can cause problems in the latter stage. It's fine if Labrador is a little under-weight but over weight can cause a lot of problems latter. So be very careful with what you feed them.