[Jleig1229]

Looking for advice: my puppy was given her first round of vaccines at 6 weeks, her second round at 10 weeks and her third round will be tomorrow at 13 weeks. My vet says I have to do a fourth round at 16 weeks before she can go outside but I’m also hearing you can start taking you puppy out after the third round.

 

[parus]

It depends on how risky the area where you live is regarding the diseases they're being vaccinated for in those last two rounds. Some places you're probably fine with a little basic risk mitigation but in other places various diseases can be super endemic. It can vary year to year, too. Personally, I'd take your vet's advice as they have personal knowledge of whether there are local outbreaks or not.

Note that vaccinations aren't instantaneous, either - it takes a while after the jab for dogs to build up the antibodies necessary to prevent disease.

 

[BKaymuttleycrew]

While I agree that it's important to minimize the possibility of exposing your puppy to disease before they're fully vaccinated, it's also important (many behaviorists say more important) to begin socializing them before the window closes. At 13 weeks, you're already getting very near, if not past, the prime socialization period for your puppy. "Socialization" isn't about taking them to the dog park & letting them run amuck around tons of dogs, or even walking them around a heavily dog trafficked park, it's slowly exposing them to novel things in a safe & controlled manner & making sure the experiences are GOOD ones. This can absolutely be done without putting the puppy at high risk for disease exposure.
The following article explains it well:

Puppy Socialization: How to Socialize a Puppy

Socialization is the greatest gift you can give your dog. Learn how to socialize your dog safely and effectively from AKC's dog training experts.

www.akc.org

I also highly recommend you download a copy of this new (excellent) book:

Puppy Socialization: What It Is and How to Do It - Kindle edition by Rogers, Marge, Anderson, Eileen. Crafts, Hobbies & Home Kindle eBooks @ Amazon.com.

Puppy Socialization: What It Is and How to Do It - Kindle edition by Rogers, Marge, Anderson, Eileen. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Puppy Socialization: What It Is and How to Do It.

www.amazon.com