Hello Thinakaran, the only way is to get it exercise well. Not only walking but fetching the ball, jumping, running. Spend one hr with this things till ur dog gets tired and its tongue comes out and waters.Then give him fresh water, it drinks lots of water that time. This helps to clear its digestive track. feed ur puppy with pedegree soked in milk for half an hr(daily once or twice). Beef should be cooked well with more water. Let it become watery but it should be well cooked. C the change in your dog.