From here:
Other sites mention that they blind people generally have the dog go before leaving home in a special area that can be cleaned easily.
It also seems service animals are exempt from laws regarding animal waste, etc. in most places.
In defense of the dog that pooped in the grocery store, it’s a dog, a living creature. No matter how highly trained it is as prone to sudden pooping attacks as any other creature. Being out in public, seeing eye/other aid dogs may encounter various tummy germs more often than dogs confined to home.
Or else the owner has just gotten lazy and allowed bad habits to form.
I worked with one blind woman who partially solved the seeing eye doggie doo issue by having ME walk her dog! (Off harness of course) As it happened, Ebony never pooed while I had him on leash, but if he had I would have picked up after him (this was in the Chicago River North area - the dog pretty much had no choice but the sidewalk). She herself, although blind enough to qualify for a dog, was not totally blind and probably could pick up after him, it was just hard for her as she was also getting older and frailer, and particularly in winter this was a problem for her. She did not hesistate to ask for help, though.
The other blind-person-with-dog I worked with was much younger and healthier and did all his own dog-walking. He was completely and totally blind, but that didn’t stop him from re-roofing his own house, trapping squirrels in his attic, and otherwise doing a lot of things you might thing difficult or impossible for the blind. He managed. I suspect he figured out how to find Clifford’s doggie poop and deal with it, maybe even like the method mentioned above. Or maybe he asked for assistance, he never seemed shy about doing so when necessary.
(Off topic, but when the fuses got blown at work we used to send him to flip the circuit breakers as the box was in a dark and difficult to access place. He didn’t care about the darkness, and was deemed least likely to hurt himself getting to the box because he was used to not being able to see where he was going. He would flip stuff until he could hear us shouting the lights were back on. He said he knew when they went out because he could hear his dog crashing into stuff.)
My family is currently training a future guide dog, from puppyhood to ~1 year old. A big part of this training is getting it to defecate on demand, in a special area outside the house.
Not at all. Why would they? City-dwellers in particular are supposed to poop-scoop after their animals. It think the first laws about this were in major cities.
Quite right. We’ve raised four guide dog puppies, the last of which is a breeder and still with us. And she just had four fat girls in her third litter. 
You get them at six weeks, and the first thing you do is to train them to go only on command, which is “Do Your Business.” When very small you train by repeating that when they go, so they associate it with going, and then when they are a little bigger you don’t let them go unless you say it. Our breeder is four, and we’ve slacked off the training, since she will never be a guide, but she still knows the command. When you go on outings with other dogs in a club, it is cool to see ten dogs all go at once.
They are trained to not go when working. You train them with a jacket, and take it off before letting them go. They know very well when they are working, ours, even when puppies, behaved themselves much better with their jackets on.
Part of training is going places like supermarkets, restaurants and malls with the dogs. When they are little they have accidents from time to time, but by 9 months they are very good.
I don’t know the details of how a blind person picks up the poop, but I’d guess a good sense of smell helps, plus our dog goes in the park in the same five square foot area almost every day, and we’re not even trying to make her go in the same place. Guide dogs are also pretty big, and our Labs and Goldens have easy to clean up poop for the most part.
Guide dogs have been bred to be able to do this for 60 years, so it’s not surprising they are good at it.
You mean they never go outside? Never at all? And no offense, dude, but that’s just disgusting.
To be fair, my aunt just has a little corner of her laundry room where her dog pees if she can’t go outside. Yeah, I think that’s disgusting too, but I don’t go in her house all that often.
(I wonder if it’s possible to litter train dogs-you know, just get a bigger, deeper litter box?)
I actually used to manage a pet store; our avian specialist, when discussing the idea of on-command elimination used to caution people about this exact scenario!
That is quite remarkable - I mean, I know parrots are highly intelligent and trainable - it’s just that I didn’t think birds had a great deal of voluntary control over excretory functions, nor a great deal of space to ‘hold it in’
Yup, but you don’t want 'em scuffling around in litter (“Whee! Digging is awesome!”), so you use pee-pads instead.
Not even guide dogs, but just regular dogs can be trained to use a special location for pooping fairly easily. One neighbor trained his to use a special part of the backyard (covered in rocks rather than grass) for this. Then every week or so he just washed it down with a hose – didn’t take much more than that to keep it presentable.
Someone I know inadvertantly “snow-trained” her puppy–acquired in mid-winter. She didn’t realize that the puppy thought snow was the only acceptable place to poop until the snow started to melt, and had a few moments of worry as the dog only pooped in the shrinking patch of snow.
And then one day, there was no snow at all. So dog and owner settled into the yard for the afternoon. And when the now-frantic dog could hold it no longer, owner made a big fuss over the good dog, and the dog had an amazing expression of relief. No more problems.
Several members of my bird community have trained their birds to either poop by the command “poop” or to poop when held over the trash can.
My dogs have always had a preference for one area of the yard to poop in, so that helps with the cleanup.
Oh, the temptation to abuse this! 
Sure. If we ever get another dog, we’re going to train it that way. Guide dogs aren’t necessarily the smartest dogs - our pet dog, half border collie, is way smarter than any of our guide puppies. In fact, since guides have to stay under desks and things much of the day, being too smart wouldn’t be an asset.
But I said I thought they were better trained. To illustrate, MY dogs, who were trained, but not particularly well-trained and certainly not to the level of a seeing-eye dog, would not have done this.
How, or more importantly, why would one train a bird to poop on command? They’re usually in cages, right? And when they’re not its not like they’re pooping all over the house, right? Usually they’re busy flying, checking stuff out… etc… right?
Actually, I and many parrot owners give our birds considerable time outside the cage every day. In fact, if we’re home the birds are usually out. Mostly, they stay either on top of their cages or on the bird play-pen we have for them, but untrained birds are more likely to “poop all over” than untrained birds.
I’ve trained my birds that they are not to stand on my shoulders unless I’m wearing the “bird shirt” - an old flannel shirt I don’t care if it gets the occasional poop on it. This keeps them from mobbing me while wearing my good clothes in the morning before I go to work. The downside is that when on put on the bird shirt I get mobbed by the family flock like a mess of seagulls descending on a french fry.
Actually, the coprodeum has huge reserve capacity. If you look at droppings made by a bird that is incubating eggs, they will come out of the nest and leave a huge pile.
I once had a yellow naped amazon parrot that spent most of his time out of the cage. Trying to keep things neat, I’d return the bird to the top of its cage periodically until he eliminated. Although “training” was not my goal, over time I noticed that he would fly to his cage, eliminate, then fly back to me.
Actually… yes, they are pooping all over the house. Birds don’t have any particular compunction about pooping or not pooping, unless they’ve been trained for it. They’re very messy pets.
On the opposite end of the psittacine owner spectrum from Broomstick, I see a guy walking around my farmer’s market every week with an amazon on his shoulder and a long trail of poo and urate running down his back. You’d think the guy would at least drape a tea-towel over his shoulder or something. Urk!
I’m intrigued by the OP’s dogs too- I’m still waiting to find out if they actually never ever go outside at all.