It’s important for a dog to have new experiences but chief among them is meeting new people and animals.
George starts his puppy course in 3 weeks so I am trying to have him me as many other folks and pets as possible.
When we first had George, he was nervous of most things and would react defensively to dog, cats and people.
We have walked him a lot, meeting as many folk as we can and encouraging him that all was okay. Taking him into new situations has improved his acceptance of new things and he now actively seeks out new meets.
This all bodes well for his course and hopefully he will be less distracted by other dogs and therefore able to focus better.