Although your toys and water selection should be self-explanatory, the food you get is very important. Be sure to find out which brand of food your new addition has been eating. Since your puppy has a sensitive stomach, sticking with a food that he knows is a wise decision. If you want to switch the food later on simply mix a small amount of the new food in with the old, slightly increasing the amount with time. This will be easier on the puppy's digestive system.
When you go to actually pick up your puppy, make sure that you have a comfortable bed or basket with you for his ride home. A box or basket with a soft blanket placed inside can make an appropriate carrier. Some chew toys are also helpful to entertain and distract your puppy during the trip. While you are traveling, ease his fears by talking to him in a gentle voice and petting him soothingly.
Although it might be hard to control your excitement, try to stay calm during the introduction of your new puppy to other family members or pets. Hold him gently in your arms as you give him a tour of his new home. This will help him feel more at ease in the new surroundings.
Before bringing your puppy home, it is important to decide where he will sleep. Make a bed for him and place toys and water nearby. Don't force him into his sleep spot - let him check it out on his own first.
Don't feed your puppy too much on the first day because he might be overwhelmed and not be very hungry. He will have to go to the bathroom frequently. You can start teaching him where to go on the first day, but don't expect instant success. It is better to try to anticipate when he has to go and get him outside quickly, praising him when he succeeds in going "potty".
When you're ready for bringing your puppy home, make sure you have a whole day to devote to him and his needs. The first day is an important bonding experience in which you'll need to make him feel comfortable, relaxed, and secure. Use a soft voice when you speak to him and pet him gently. Let him explore and play, but keep in mind that he'll get worn out quickly.