How do I introduce a second dog please

[snowdrop6]

I have a 2 year old dog .im rescuing from a family member another dog of web sites....I've only ever had one dog at a time....if I don't take it it's going to be free for anyone who wants it on line..
So how is best to do this ...what works and is best for both dogs.thanks in advance

Oh I dont want to sound negative but it is a really bad idea to get a dog unless you get it from a reputable rescue or breeder Rehoming through an internet site is asking for loads of problems.

The dog could have any issues health or behavioural. It could also be a scam to get people to buy the dog in the first place saying it will be given away as there are always kind hearted people around like you

What would be better for the dog and you is to contact a local rescue say you sill sponsor the dog but let them rehome it.They will have people to assess the dog and find it a suitable home.

Really bad idea. They should rehome their dog responsibly. Don't make it your problem.