Back in the day, Irish and Red Setters were the doggies de rigueur. And Afghan hounds and Old English Sheepdogs were equally popular. I haven’t seen any of those noted in at least 30 years!!
Where’d they go?
Well, there’s this farm, upstate…
I haven’t seen a real poodle, or one of those miniature (large rat size) breeds in years.
Maybe any dog breed NOT found on this list:
The Old English Sheepdogs were high maintenance as I recall. After being super popular in the 60s into the 70s they seemed to all but disappear by the 80s. I’m a little surprised, they had a rep for being smart & gentle dogs but maybe the hair was just too much.
I never remember seeing many Irish Setters but they are a lot rarer now. In theory they can be tough pets like Dalmations. High energy dogs. Irish Setters were bred as hunting dogs.
Afghans are notoriously the dumbest dog breed. I’ve seen at least 2 studies that place them dead last. This article links to one of them.
Collies.
Huh; I see a lot more of those (there are 2 or 3 on my block) than Saint Bernards, Caucasian Shepherds, and Great Danes.
Dalmations. They were the craze after the 101 Dalmations movie (the one in '96). IIRC they turned out to be high maintenance and not a good choice for someone who bought them solely because their child wanted “a spotted dog, just like in the movie”.
I don’t think I’ve seen a Doberman in decades. I think miniature ones were big for a while (pun intended) but even those seem to be few and far between, around here at least.
I had an afghan hound and he was anything but dumb, but he thought like a lawyer. If it was wrong to take food from the counters, if you moved the container the food was in to the floor, then it’s floor food, and that must be okay. Siddhartha was a sweet, loving dog. Unfortunately Afghans don’t fit on the farm life I have now - too much grooming.
I had an English setter not too long ago, one I got from the pound, left behind to starve by hunters. He was a very sweet dog, very clingy because of being dumped and nearly starved to death. I still do rescue setter transport because of Pat.
I’ll add cocker spaniels to the list. Formerly one of the most popular breeds, you really don’t see them much now.
StG
It must be a regional thing, or social circles. One of my neighbors has a doberman, and she also used to have a standard poodle. I sell basket muzzles designed for greyhounds in my shop and a standard poodle owner discovered that they fit her poodle very well and started telling all of her social circle. So now I am occasionally getting orders and pictures of poodles from customers.
Used to have a neighbor with a Dalmation. I go to greyhound social events and people love to adopt a variety of sighthounds, so I fairly regularly see afghan hounds, wolfhounds and the occasional deerhound.
Sudden onset aggression. As a former dog groomer, I can tell you that cockers were my least favourite breed to groom.
I spotted an albino Dalmatian. It was the least I could do for the poor thing.
Canine just tell you how clever you are! 
Dalmatian, people. Jeez. It’s from Dalmatia, not Dalmatio. Do you write Caucasion was well?
The breeds that seemed to be common when I was a kid in the '70s, and which I rarely see now, have already been mentioned: collies, Irish setters, cocker spaniels, old English sheepdogs, and toy/miniature poodles.
It’s interesting (though not surprising) that most of those breeds likely had their popularity driven, at least in part, by movies and TV shows. For cocker spaniels, in particular, I’ve read that they had become very inbred when they were popular, which led to a lot of health issues in the breed.
I used to babysit (in the late 70s/early 80s) for a family that bred Irish Setters. They were beautiful dogs, but dumb as soap. And these were well trained, well bred show dogs who won prizes.
They were also pretty high maintenance. They required regular grooming. In this case the father worked and Mom stayed home with dogs and kids. But in a two career family, a setter would end up a tangled mess.
I’ve never heard of either of these places.
Dalmatia was once a province in the Roman Empire, across the Adriatic from Italy; it is now a region in Croatia.
There are definitely some regional dog preferences. In 2014 I was in Wales and England for a couple of weeks and lost track of how many Cavalier King Charles Spaniels, Blenheim variety, I saw. It was the pet du jour; there was even one on the dolphin-watching boat tour into Cardigan Bay. I doubt I’ve ever seen more than one in Toronto in the intervening years, and I’m the type of person who reacts with “PUPPYYYYY” every time I pass a dog on the street.
Dobermans seem to be much more rare than in the past. Maybe people don’t feel they need a guard dog with all of the home surveillance cameras they’ve installed??
Mutts - they’ve gone extinct, but now we have all of these new breeds like goldendoodles & maltipoos & ___.
I’m at the dog park a lot and I see dobermans and standard (“tall”) poodles still. People like standard poodles because they don’t shed.
The OP’s right though I don’t see spaniels at all, or the other dogs mentioned.