These physical problems are often brought on my unavoidable stress, and are similar to problems you might have if you were moving to a new area. Just like you, the puppy may not sleep or eat as regularly as it would in more familiar surroundings. Some puppies ease through the transition to their new homes, while others may have a harder time. The most important objective is to get the puppy to eat. Some puppies require privacy, coaxing, or companionship to eat.
Every puppy is different.
The puppy might not eat the strange new food, or if it does eat, develop diarrhea leading to dehydration and other complications. Diet changes should be made over a 2-4 week period to prevent digestive upsets. To encourage the pup to drink and reduce the risk of low blood sugar, you might put some honey in it s mouth or on a dish. Too much honey, however, will depress the appetite. If the puppy does not eat after these methods have been tried, you might try warming the food.