Here is a question and answer about introducing dogs to one another. In this case, John is combining two households and is concerned about how his pets will get along with the newcomers. 

Question

I will shortly be combining two households and will be introducing a number of dogs to one another. I have an 11yr old Weimaraner spayed and a 6 yr old neutered male. Obviously the bitch is Alpha however the other household has two 4 month old Golden Retreivers. Any suggestions or words of caution? Do I introduce them on neutral ground not that it matters to the little ones? Any tips would be welcome. Thanks

Hi John
You do not say whether the adult dogs are socialized. If not, place puppies in a safe wire pen, one at a time and let adult dogs (one at a time) sniff the pups, and watch for any aggression. They might be fine … or they might never accept puppies.
The risk is the dogs of the same sex which may take exception to each other. You do not mention the pups gender, so I am assuming they are a boy and a girl.

Assuming the adults are well socialized and friendly, don’t throw them all together. Do introduce one at a time. Adult dogs one at a time get to meet pups one at a time.
A park would be a good place to try.
Take care and good luck
Glynne