Ajax, my border collie/Pyranese mix, was about 18 or 19 when he died. Long life for such a big dog.
My sister had a mostly-Pomeranian rescue dog who was blind, and he lived to be about 16. <3 He was, no kidding, the cutest, most charming dog I have ever met.
Our childhood dog, who was of panoramic provenance but was mostly dachshund, also lived to be 16, although he really had no quality of life for the past few months. Finally, my dad agreed that he (the dog) needed to go over the Rainbow Bridge, and reluctantly took him to the vet to do the deed.
My recently departed Blackjack made it about 16 years. He was a 75 pound dog. I’ve had smaller and larger dogs before and none of them made it that far. He was remarkably healthy until the last couple of years.
Our last dog, who was likely a mix of a Cardigan Corgi and a Schipperke (around 25 pounds), made it to 17.
We had a Dalmatian-terrier mix who lived to be 18. Never sick a day in his life. He’s been gone 27 years and I still miss him.
I have a 17 year old miniature dachshund. He’s in good health for his age, but he’s really slowed down. Lately he’s even been having trouble with the one small stop from my front door to the porch. I had the same dog (also a miniature dachshund from first grade through my sophomore year of college; he finally had to be put down because he suffered a bunch of seizures and then a stoke. 
Also, and I can’t emphasise this enough, if you have ever to put the family dog to sleep it’s a really, really bad idea to call your 19 year old son at college and break the news to him over the phone. I did not handle that well at all. I broke down crying on the phone & started screaming profanity (load enough to freak out my roommates) at my mother, smashed the phone against the wall, and got drunk enough to almost end up in the ER. It was bad on my mother’s end to because she was already distraught when she called me, then had to listed to me have a breakdown, then had line suddenly drop, and me not answer my phone for over a day. I never told her about the alcohol poisoning part.
Male beagle made it to 18.
My female chow chow turned 15 in July. She is definitely showing her age and has declined a lot over the last year but she still has some fight in her.
We had a dog that lived to be about 18, or 19. He was a small to medium sized mutt. We got him when I was in first or second grade and he died when I was like 27 or 28,
My own most long-lived dog lasted till age 13, and I only got her when she was already 8, so I only had five years with her. She was a beagle-dachshund mix.
A friend had a toy poodle who lived to 22 and a standard poodle who lived to be 16 even though he had epilepsy most of his life.
My next-door neighbor has a toy dachshund (or miniature, or anyway not full-sized) who is 17.
My own most long-lived dog lasted till age 13, and I only got her when she was already 8, so I only had five years with her. She had a tough life and was neglected and overfed when I got her, but I fixed the fat-dog part of that. She was a beagle-dachshund mix.
A friend had a toy poodle who lived to 22 and a standard poodle who lived to be 16 even though he had epilepsy most of his life.
My next-door neighbor has a toy dachshund (or miniature, or anyway not full-sized) who is 17.
My miniature schnauzer made it to a couple months past 14. A few weeks ago I was in Ireland and met a retired sheepdog that was 19 and while obviously elderly, still got around. That’s the oldest dog I ever knowingly encountered.
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I had a Dalmatian (purebred) who I had to have PTS at 18 because of an inoperable tumor.
I’ve had very elderly Labs (also purebred), one was 15 and the other 16.
My baby girl Ember – she was an Aussie Shepard/Border Collie Mix – passed just shy of 17. Her body basically gave out, according to our vet.
Our first malamute, Missy, passed at 14, which is very old for that breed. She’d beaten cancer twice and, like Ember, her body just gave out.
We had to put down a 21-year old mix, half dachshund, half beagle. He was deaf and cranky but happily did his daily routine. I got him when I was three, and named him Alvin after my favorite TV character.
I was 24 when we put him down. 
When we got Fido (my first and perhaps best dog), I was two-and-change years old and he was a little collie-mutt pup.
Nineteen years later, the old feller died peacefully on our back porch. I’d already left home by then but I was visiting when it happened. I cried, too.
Our big collie guy, Jack, turns 14 next week. Knock on wood, he’s in excellent physical and mental shape.
Our medium border collie, Scout, turned 12 in August. Also in excellent shape, she runs a few miles every day chasing tennis balls.
My dog who I still miss terribly that I lost in January was 17. She would have turned 18 next month.
The dog I have now is 15. Mostly blind and deaf, but he gets around. Two weeks ago I thought he didn’t have much longer, but now he’s back to what is normal for him.
The family dog we had growing up made it to 17 (beagle/terrier).
My mastiff almost made it to 12, old for that breed.
I knew a great dane who made it to 17, very old for a dane. Also, a friend’s husky made it to 17.
My aunt and uncle recently had to put their shi-tzu to sleep – she was about 17.