I own several dogs and lurk on several dog forums. One thing that pops up again and again is how long these people’s dogs seem to live. I’ve heard of small breeds/mixes making it anywhere from 18-22 and large breeds/mixes making it from 15-18.
My two past dogs barely made it past 10. One, a small mix, made it to 13 ,but had to be euthanized due to cancer and the other, a lab mix, made it to either 11 or 12, and just fell apart.
My last dog, a rat terrier mix, was 17 when we finally had to send him to doggie heaven. Small dogs live longer than big dogs generally.
My cousin just put down her 21-year old pomeranian this year.
Nope. The last one I had to euthanize was a large LabX who didn’t make it to his ninth birthday. He had severe hip dysplasia, which was diagnosed shortly after I adopted him at nine months old. I knew he wasn’t going to live a long life, but I didn’t expect him to be in so much pain quite so young. Back yard breeders suck.
Before that my Rotti X made it to about 13, though her last few years she didn’t do much more than eat, sleep and wander about the yard. Still wagged her tail and wanted her ball, right until the end.
Longest lived close to me was the boyfriend’s old Shepherd/HuskyX, who was 15 or so when the time came. Definitely frail and elderly, but still getting around and being a dog until that point.
Oldest dog right now is a Malinois who is 11 and starting to show his age. Still runs and chases the ball and loves to go for walks, but has slowed down from the insanity of his prime years. Not sure how long he has…
Our 70lb. mixed breed made it to 15 1/2, and we had her from a puppy, so we are sure of her age. She was in excellent health until the last six weeks or so, when she began to slow down, and it was clear arthritis was catching up with her. She died in her sleep, without seizures or anything, just napping on her comfy bed.
We don’t know what she was exactly: best guess was 1/2 Lab, 1/2 some kind of hound dog. She looked like a Lab at first blush, but then you realized she had jowls like a hound, longer ears than a Lab, bigger paws, and a very long back. She play-wrestled with much younger dogs, and ran around with seemingly boundless energy up until about 14.
She was a great dog.
Grew up with three bulldogs – one died at 2 after minor surgery on her foot (never woke up); one died at 11, was put to sleep at home because he couldn’t stand up or eat anymore; the last one died at 6 and a half just months after the older dog died – she just keeled over all of a sudden, and we thought she died of a broken heart (probably literally as well as figuratively). No more dogs after that, though I’d like to get one once I have a house with a yard.
Little dogs seem to stick around longer (anecdotal evidence only). My little guy is just closing in on 10 right now, and is really spry.
Our baby Dog is a cocker spaniel mix that is over 20. We adopted her from a previous owner so not exactly sure, but she has been with us for 19 years. She has really slowed down but still wags her tail with enthusiasm if you call her.
dennis
My 105 pound male Samoyed made it to 15 1/2. He was healthy and gorgeous until the very end. He simply died of heart failure one day.
Our 85 pound Dalmatian / Lab mix made it to past 13, but we put her down at the first sign of her no longer being able to completely care for herself. She was fiercely independent and hated help from anyone, even her beloved Daddy, so watching her start to struggle after a stroke (and long-running Cushings), we felt it was time. She was becoming growly and incapacitated, so it was the right call, especially given my husband’s own decking health. But it still felt way too soon. I miss them both so much.
My mom had a pack of Bichons (horrible, terrible dogs) that all lived waaaay too long, into their mid-teens. Good Riddance!
My sister’s oldest Chihuahua is ~19. When she rescued him, the vet estimated him at around five years old and that’s been 14 years now. She buried an 18 year old Chihuahua mix last year. Her younger ones will last well into her retirement at this rate. 
I had The Best Dog Ever - Jake the Wonder Mutt - a large sighthound, maybe chart Polski. He was about 16 when he had to be put down in 2009. 80 pounds of sweet, smart pure love, and the only large dog I had that lived so long.
My mom’s Elwood is probably 18 - he was a stray when my dad brought him home 14 years ago, and the vet estimated that he was 3-5 years old then. King Charles spaniel mix. Poor little guy is nearly blind, and has lost almost all of his teeth, and is still an ornery little cuss, but he’s still going.
Most of my dogs have been large or giant breeds, and no, they don’t live as long as the little ones. We lost Sebastian the Pyrenees to bone cancer when he was only about 5. Mojo the German Shepherd was about 11 when we had to put him down, due to neurological problems. My current Pyrenees/St. Bernard mix will be 5 in January, and she is definitely a middle aged lady. Any years with her past 9 or 10 will be considered a bonus…
I had a pair of Schipperkes that made it to 17. A brother and sister. They passed within 6 months of each other. 
Oddly enough, today is the anniversary of when the boy (Simon) passed 4 years ago.
Folks had a yellow lab that lived to 13, border collie that made it to 12 (they overfed her to death.) And a collie/lab mix that made it to 15.
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Our purebred Dalmatian almost made it to 15 years.
Purebred border collie lived to 18. All the rest of my dogs (3 Great Danes) all died between 6 and 8 years old. I have a pit mix right now that is 7 and appears to have just hit his prime.
We had a Dachshund who made it to just a month shy of 17.
My pups of choice are racing greyhounds which have a life expectancy of 12 - 15 years - longer than average for large dogs. I knew someone who had a greyhound that lived to 19 years.
Same here - same breed, same age. Terriers are tough little dogs; I suspect Max would have lived another 6 months (maybe even a year) riddled with cancer, and would have barely showed it.
As soon as life settles back down to a reasonable pace, I’m headed to a shelter to look for another “feist.” Love those dogs.