20/10/2026
Before your puppy's second vaccination, there is one question worth asking your vet.
In the past, I would often see puppies in my puppy classes at about 11 or 12 weeks old. They had had their vaccinations, they had done their week of waiting, and they would come along to class. So if there were any issues, like a puppy being fearful of other puppies, protective of their food or chews, or scared of the harness or lead, we could pick them up early, before they had a chance to set in.
Recently, though, I am seeing more and more puppies who are not getting out until they are 14, 15, 16 weeks old.
A few weeks ago, I had a large breed puppy come to our socialisation session at 15 weeks old.
That puppy was scared of other dogs and people, would try to hide, but would also growl at the other puppies.
I am also currently working with a six-month-old small breed puppy who did not start going out on walks until he was almost 16 weeks old. He did not get those early interactions with other dogs or that early exposure to the world, so now he is worried about them and barks at every dog and every person he sees on walks. He is a small breed too, so he lives in a world of giants, and things are potentially even scarier for him.
So why does this matter so much?
We talk about the socialisation period and how important it is, but here is why.
From about 3 weeks of age until about 12 to 14 weeks, puppies are in their socialisation period.
During that time a puppy's curiosity outweighs their fear, so they are much more likely to approach new things and much less likely to be frightened of them.
They also recover, or bounce back, from mildly fear-inducing experiences a lot faster at this age.
If those experiences are positive or even neutral, the puppy's brain is creating a reference library: "I have seen a child running with a toy, nothing bad happened, so that is safe. I have seen a big dog, a small dog, a black dog, a fluffy dog, and none of them hurt me, so those dogs are OK."
A few positive or even neutral experiences can be enough to create that reference.
It is worth noting that every puppy is an individual, and it is not like we hit 14 weeks and the puppy turns into a pumpkin.
Puppies can absolutely still learn about the world after that.
It just means we need to be more careful, may need more exposures and more pairing of things with treats, play and good things, and it could be more time consuming.
So why are puppies going out later?
In my experience, we have had changes in vaccinations, and it is making a difference.
Puppy vaccinations cover two main things: DHP (distemper, hepatitis and parvovirus) and leptospirosis, or lepto, which is carried by rats.
Depending on the vaccine your vet uses, the second DHP can be given two weeks after the first, as long as your puppy is at least 10 weeks old.
A week after that, your puppy can go out to most places, while still avoiding areas where rats are more likely, like farmyards and riverbanks.
Lepto 4 needs its two doses four weeks apart.
So what I am seeing is the second appointment being booked for four weeks after the first, when the Lepto 4 is due, and puppies staying indoors for two weeks or more, right when they should be out discovering the world.
Having the second dose of DHP given separately from the lepto will usually allow you to take your puppy out at least a couple of weeks earlier.
And when it comes to socialisation, that is a really big deal!
Some vet practices already split the second appointment, giving the DHP first and the lepto later, for exactly this reason.
It does depend on which vaccine your vet uses, so it is a conversation to have with them.
And if your puppy had their first vaccination at the breeder's, find out which vaccine it was and let your vet know when you book, because I have seen vaccination courses that needed to be started again (and that delays going out even further).
So here is the question to ask your vet: "What can we do to make sure my puppy can go out as soon as safely possible? I would like to start getting out while they are still in their socialisation period."
And then see what your vet says. It is really important to have your vet's advice, as the disease situation in your area may be completely different to the disease situation in mine, so I would absolutely, 100% take my vet's advice on this.
In the meantime, there is still a lot you can do before your puppy is fully vaccinated to help with socialisation.
Sit in the open boot of the car in a supermarket car park and let them watch the world go by. Put their bed in a trolley and wheel them around the garden centre so they can take everything in from the safety of their own bed.
Have visitors round, so they get used to people coming and going, and visit friends with vaccinated, well-adjusted dogs who are happy to have a puppy in their space.
Carrying puppies is great too, but it can be harder to read their body language when they are in your arms, so I would mix it up.
And remember, socialisation does not equal interaction. We want our puppies to be OK with seeing buses and traffic going past, but we do not want them to go and say hello to the buses.
If your puppy's tail is tucked under, their ears are back and they are trying to escape the situation, it is too much for them.
If you have a puppy, check your vaccination schedule and give your vet a call to discuss it.
If you are getting ready to welcome a puppy home, save this and share it with anybody with a new puppy, so more puppies do not miss out on those very, very crucial first few weeks.
References (links in the comments):
• MSD Animal Health, vaccination FAQs for vet practices (Nobivac L4)
• MSD Animal Health, Nobivac DHP product information
• Forest Vets, puppy vaccination protocol
• Veterinary Practice, Socialisation for pre-vaccination puppies
• The Kennel Club, Your puppy's first few weeks at home