Desensitizing your puppy is very important

Expose them to different noises, sounds, types of people, and experiences. Think about it, if you were never exposed to a car, you would probably be slightly freaked out and anxious. Car rides can cause a lot of anxiety for puppies. When picking up your puppy from a breeder or shelter, I would bring you and another person, so the other person can hold it or talk to it through the crate. Always try and create a positive experience so it doesn't dislike going for car rides. If anxiety is a thing for your puppy and the car, attempt short trips in the car that end with a treat when they get home.

Desensitize with things in your home, the vacuum is a big one. Turn it on and use it as you would but if the puppy chases it correct the behavior and let the puppy know this is not okay. I'm sure it will be funny to you at first, tiny puppy trying to attack the vacuum cleaner but the thing to remember about any behavior you allow as a puppy, will continue when it gets bigger, and it will not be cute then.

Different type of people is important as well, the loud baby, toddlers, tall people, and people with deep voices. If you want a well-rounded puppy, I would introduce him/her to all of these types. Again, always make it a positive experience, if they seem unsure try and reassure them by giving the person a treat to give to the puppy and just pet them. Never force a situation where the puppy is not sure.

Another part of desensitizing is the puppy. 

Massage with the puppy’s paws.

You want the puppy to get used to you touching them. Find a time when puppy is tired, or you two are relaxing together to do this. If the only time they ever get touched is going to the vet or groomers to get their nails trimmed this is not going to be a great experience for them or you. Some dogs must get sedated just for a nail trim, it is unnecessary, and with proper training you can easily avoid this. When you are messaging their paws and if they start licking or biting at you, tell them no and then slowly start doing it again. This is not meant to torture them this is meant to be a relaxing time between you and your puppy. 

Massage the puppy’s ears

Find a time when the puppy is tired or relaxing to do this. Pick up the ear look in it and then put it down. Massage the ear gently again so it’s not a foreign feeling to them. You may at one point have to put medication or clean his/her ears and this will make it easier for you.

The puppy’s mouth.

Doesn’t need to be massaged. You are going to want to be able to open the mouth whenever you need to, and the puppy be comfortable with it. This will be helpful when the puppy is running around with something in its mouth and you'll be able to just grab it. Gently opening the mouth a little then allowing the puppy to close and I would leave it at that for the first time. Next time you go to do this I would just lift its lip. This is a good way to check their teeth and get you and puppy ready when you start to brush them.

The more hands on you are with your puppy, the less they will fear you or anyone else touching them and doing the necessary things they need to do, whether the groomer needs to groom them, or the vet tech needs to clean a wound on their paw. It will be an easy and fearless process for them.

Vet tech story time:

It is very common to have dogs come in for nail trims, unfortunately it was always up in the air if the dog was friendly or not. It was always a question, is it friendly, does it need to be sedated, and is it already sedated. I want to make it loud and clear, nail trims when a dog is fearful is not fun. I felt terrible for them. Here are some strangers to this dog doing things he is not comfortable with and sometimes these dogs will poop, pee, and express their anal glands all in one shot when they get their nails trimmed. How awful! Regardless this should never be a situation. Please don't let you dog become one of these dogs that are so fearful of getting their nails trimmed that they need to be sedated.