It is perfectly OK for your pup to meet other (vaccinated) dogs before they've finished their round of vaccinations - either in their own home or yours. Vaccinated dogs aren't carriers. Obviously not in the park or public places but either home or garden is fine. Just thought it was worth a mention for those who may have their first dog and be worried about it.
Re: Socialising & meeting other dogs Absolutely agree Gordon. I think there are one or two exceptions to this, but there is to any rule, but the socialisation time is vital to capitalise upon.