Loner Dog?

LCD

We have a terrier cross and are thinking about getting another dog. However from what I can tell our dog is not very "sociable". Whenever he meets other dogs out walking a quick sniff then he looses interest. When staying in friends houses with dogs he never interacts with them.
Do some dogs not prefer the company of other dogs & just like being on their own?

DBB

Most definitely op... They're just like us really. Some are real socialites, others couldn't care less if they ever saw another dog, whilst most lie somewhere in between
Your fella sounds like he's strongly leaning to the 2nd category, a lot of terriers are the same. My old Westie fella was very much into being the only dog, but I pushed ahead and got a 2nd dog when he was about 3. It took a long, long time for him to accept her, and that's all he ever did was accept her, and tolerate her. They were never friends, just housemates.
One critical thing was that she is very polite and quiet herself... Had she been an overly dog-friendly dog, trying to make friends with yer man the whole time, the whole thing would have been a catastrophic failure. But she respected him, as he did her, and they found a quiet, perhaps rather grudging harmony eventually... But it took many months.
I often feel guilty for forcing him to live with another dog, but on the flip side, because she is such a little lady, it worked as well as could be expected and probably made him a little more accepting of other dogs. I added a 3rd dog to the mix as he got older... Another total lady, and he actually quite liked her, and kinda flirted with her at times

BrokenArrows

Do you have any friends with dogs?
Try and get them to bring the dog over regularly over a few weeks and see if your dogs attitude changes.

Latatian

Dogs are like people, they usually will not like every other dog they meet. If he's not afraid, if he's polite, I wouldn't worry about it. If he is doing the quick sniff thing then he is being polite and doing the minimum interaction so I wouldn't worry.

You might find that he might develop one or two dogs that he likes once he knows (or dislikes once he knows). They have their own preferences. It's like how some dogs do not play as adults, and others do. I have one social butterfly who wants to say an enthusiastic, affectionate hello to every other dog or human that they meet, and honestly before she learned better social skills she could be a right pain. If he's not being a bother to other dogs then I would not worry about it.

If you want him to have dogs he socially interacts with regularly you can bring him on walks with the same dog a couple of times and see if he ever gets more interested in interaction. But pick a dog that is sort of like him- not too bouncy and friendly as DBB rightly says, not afraid. And do a walk together on neutral territory, not your house, not the other dog's house.