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Okay, so this one probably belongs on the rpd.breeds, but I thought y'all might enjoy it. Went to the vet ... on the breed is generally not that black, and that the black tips on his coat are just really prominent.

My guess (and no, I haven't looked at the rest of the thread to see what others have guessed) would be Leonberger. I know 5 or 6 of them, and they're great dogs.
There's one that visits a local park. I'm usually really good at identifying breeds on the street, but I asked this woman one day what kind of mix her dog was. She introduced me to her Leonberger.

Cal? He and Rocsi have grown up together. :-)
Cal? He and Rocsi have grown up together. :-)

Don't remember his name, but I'd be surprised if more than one Leonberger visits REL. Emotion: smile Owner is a woman in (?) late 40s to mid 50s.

He's a lovely, lovely dog. I'm envious that you know him.

Cate
Don't remember his name, but I'd be surprised if more than one Leonberger visits REL. Emotion: smile

Be surprised- there are at least 3 of them, although Cal is the one who's there most regularly.
Owner is a woman in (?) late 40s to mid 50s.

Right age for Cal's owner (whose name, of course, is escaping me)... and they're up there all the time, because they live nearby. She's shortish (although I think she's a bit taller than me), stocky, with short streaky hair?
He's a lovely, lovely dog. I'm envious that you know him.

He's about 6 months younger than Rocsi, and they used to play together when they were little - of course, he was already twice her size when he was
10 weeks. Nowadays, I think his HEAD is as big she is. Probably bigger. We had to keep them seperated for about 6 months, though; when he got to about 10 months, he went through a bratty teenage phase in which he thought it was funny to whap her on the back with his paw, whereupon she'd get really *** off (not surprising, since he was hitting her pretty hard), fly at his head, and bite his face - a couple of times, she ended up literally hanging from his jowls, growling. He thought this was even funnier.
But he outgrew it, and now they're buddies again.
Be surprised- there are at least 3 of them, although Cal is the one who's there most regularly.

Holy crap. I am surprised. I keep forgetting Baltimore is much bigger than where I last lived.
Right age for Cal's owner (whose name, of course, is escaping me)... and they're up there all the time, because they live nearby. She's shortish (although I think she's a bit taller than me), stocky, with short streaky hair?

Don't think so. The woman I'm thinking of (never got her name) isn't stocky and IIRC doesn't have streaks. Short, not as petite as you, but smallish. But it's been nearly a year since I saw him. We don't go very regularly.
But he outgrew it, and now they're buddies again.

Nice.
The few times Orson's seen this dog, once he finally sees/recognizes the size of him, he pretends not to notice. He's scared of any dog bigger than he is.
Cate
Holy crap. I am surprised. I keep forgetting Baltimore is much >biggerthan where I last lived.

Yah, it only seems like a small town.
But it's been nearly a year since I saw him. We don't go very >regularly.

I'm fairly sure it's still the same person; thinking about it, she's only stocky in comparison to me (which doesn't take much!), and what I'm thinking of as "streaky" isn't cosmetically done.
The few times Orson's seen this dog, once he finally sees/recognizes the size of him, he pretends not to notice. He's scared of any dog bigger than he is.

Quite a few dogs have that reaction to Cal, I've noticed. He's a big friendly goof, for the most part (once in a while he'll get into being macho with another largish male), but his sheer size and presence seems to make him scary to some.
Yah, it only seems like a small town.

It's been over a year, and I still have trouble remembering that it takes more than 15 minutes to get anywhere. I can't get it into my head.
I'm fairly sure it's still the same person; thinking about it, she's only stocky in comparison to me (which doesn't take much!),

Yeah, you and I come from different perspectives on body size. Emotion: smile
Quite a few dogs have that reaction to Cal, I've noticed. He's a big friendly goof, for the most part ... into being macho with another largish male), but his sheer size and presence seems to make him scary to some.

It cracks me up whenever Orson meets a giant dog. His ears will go to the absolute back of his head, and his eyes dart from side to side, making the whites prominent. He absolutely won't sniff or make any eye contact. He just stands there, frozen, waiting for the inspection to be over.

Cate