It's not about a hero dog, or a movie dog, or a dog show-winning dog, or a rescue dog, or a therapy dog - just a plain old dog of unknown parentage that happens to be mine.
He came from the city animal shelter, where, after being picked up as a stray a year and a half ago, he was weighed in at 50 pounds, judged to be about 6 months old, labeled a "hound mix" and put up for adoption.
At the time, pretty much everything about Ace (that's the name the shelter gave him) was a mystery - from the breeds that are in him to the home that he came from. What little shelter workers did venture to guess, such as their prediction that he would grow to be a "medium-sized" dog, would turn out to be wrong.
Ace has more than doubled in size since then and now tips the scale at nearly 116. Sprawled out, he's as long as my couch. Standing on his hind legs, he's well over 5 feet. For a while, it seemed he would never stop growing. Eventually, once he turned 2, he did.
But the mystery didn't.
The mystery just grew, fueled mostly by the three, four, five people who would stop me on the street every day to ask about Ace's origins.
I couldn't answer their questions, or my own.
Did he run away or was he abandoned? What sort of home did he start out in? Why does he cower when my hand goes above my waist? What accounts for his sweet disposition, his sociability, his gentleness, not to mention that curlicue tail that seems as if it would be more at home on a shorter, more furry dog?
Most baffling was which of the more than 400 breeds of dogs were in him. Nobody knew, though everyone, from novice to expert, seemed willing to offer a theory.
I was assured once, by a woman who owns one, that Ace is predominantly redbone coonhound. Another insisted he is part Catahoula, a breed developed by Native Americans when they bred domesticated wolves with the mastiffs that invading Spanish explorers brought to the New World. I've even been asked if he is a Kangal, the national dog of Turkey.
More often, the guesses are a mix of two or more of the following: German shepherd, Rottweiler, Labrador retriever, golden retriever, Great Dane, Akita, mastiff, malamute, husky, Rhodesian Ridgeback, pit bull and chow.
I found myself more curious about his heritage than I've ever been about my own.
I know that my background is German, Irish and Welsh - I'm a mix myself, albeit of generally beige tribes. But I've never felt the need to delve into those cultures or proclaim one as my primary heritage, maybe because I'm not 100 percent anything, or even 50 percent anything.
Like my dog, I'm just another mutt, popped out of the melting pot with no particular pedigree - and that's no problem.
In America today, while one can still take pride in one's heritage, or the components thereof, the whole notion of purity, with a few exceptions, has gone out the window.
Society is getting mixed up enough - race-wise, ethnicity-wise - that those things don't seem to matter as much as they once did. Eugenics and fencing in the gene pool are viewed by many as so politically incorrect - and scientifically stupid - they're rarely even discussed.
Except when it comes to dogs.
In the dog world, purity and bloodlines still reign - promulgated by organizations like the American Kennel Club and dog shows like Westminster in New York, where purebreds strut their stuff as an announcer tells us about the various breeds and what they "should" look like.
Maybe it's the carryover from that mindset that makes us mutt owners want to categorize our dogs, too. Maybe it's our need to label; maybe it's our desire to better understand them. Maybe it's just something to talk about.
When it comes to pet ownership in the U.S., the American Pet Products Manufacturers Association says mutts account for nearly half the dogs. The fastest-growing segment of the dog population, though - more than purebreds or mystery mixes - are hybrids, or so-called designer dogs: two breeds crossbred to produce, say, a puggle, a labradoodle or a chug, also known as a pugwawa.
Ace, I'm pretty sure, wasn't designed. He just happened when an unspayed somebody got together with an unneutered somebody. Maybe a fence was jumped. Maybe there was a back-alley meeting. Maybe (my favorite theory) a police dog responding to a call fell under the charms of an attractive golden retriever.
All these things fell into the category of things I didn't know and didn't really need to know, but very much wanted to.
So I set off to seek Ace's roots - to find out where he came from, how he ended up in the city dog pound and maybe, with a little help from technology, just exactly what breeds are in him.
I knew when the quest started that I probably wouldn't find all the answers. But I was pretty confident about the scientific piece of the puzzle. A new test, made available to the public this year, can tell you which of the 38 most popular dog breeds are in your mutt based on a DNA sample you provide by swabbing inside your dog's mouth.
That information, though its usefulness to the average mutt is debatable, would at least put me in a position to finally answer the question that - from strangers on the sidewalk, kids on the playground, even through rolled-down windows of passing cars - I'm constantly being asked:
"Hey, Mister, what kind of dog is that?"
Free screenings of the "dogumentary" Hey, Mister, What Kind of Dog is That? will be held at 7 tonight at the Idle Hour, 201 E. Fort Ave.; at 9 tomorrow night at Captain Larry's, 601 E. Fort Ave.; and at 7:30 Wednesday night at the Sly Fox Pub, 554 E. Fort Ave.
Donations will be accepted on behalf of the Baltimore Animal Rescue and Care Shelter, a nonprofit organization created in 2005 to operate the city animal shelter. Working with the city Bureau of Animal Control, its mission is to protect animals from neglect, abuse and exploitation.
Tomorrow: Back to the Shelter