I need a recommendation for a dog repellent that when put on lawns, will discourage dogs from doing their business there.
A search gives a number of products but reviews are mixed.
If you’ve dealt with this problem successfully, plse let me know–what did you use?
[Personally confronting the offenders is not an option…]
Thx in advance–
Do people not pick up after their dogs in your neck of the woods?
Bloodmeal works, but it smells and has a relatively short effective life. Not only will you need to reapply frequently, but you probably wouldn’t want to spend a lot of time in your yard.
I don’t think there is such a thing. Not anything that won’t kill your yard, at any rate. The only sure fire thing would be a fence.
Considering what my dog decides to roll in, I can’t imagine a smell that would turn him away.
I think a motion activated sprinkler is likely the best. Harmless but makes the dogs move on (and most any other critter).
Otherwise some kind of scent repellent. I have read coffee grounds or citrus peels/sprays can work but they are very short-lived and need constant reapplication.
Or, plant hedges they can’t get through. Especially things with thorns (maybe even some roses).
Fence or move.
Sorry, no easy answer. 
Wag (pun intended): Wolf urine? Hot pepper/capsaicin extract?
Bloodmeal, which is just powdered, dried blood, once it gets wet, will smell a lot worse than an entire yard full of dog shit.
I’d think that bloodmeal would be attractive to dogs, rather than a repellent. And wolf urine might well inspire competitive peeing, from dogs as well as the occasional coyote.
The motion-sensitive sprinkler option is a possibility, though difficult to calibrate to avoid wetting down passersby.
If you know whose dogs are making deposits on your lawn, you could place the poop in a little box wrapped with a ribbon and put it on the offender’s doorstep, with a kind note.
You could try putting some signs on your lawn that say something like “Damaged lawn. Please keep dogs away”. Most reasonable people would respect that and have their dogs go somewhere else. It won’t stop them all, but it should cut down on it a lot.
Why is confronting the offenders not an option? Because you don’t catch them/their dog in the act? Or because you don’t want the confrontation?
I always, always, always picked up after my dog, but if somebody had a yard sign – like one of these
I wouldn’t let him poop on their lawn in the first place.
Two different homeowners who had these in their yards – when I chatted with them – said they were very helpful, if not totally successful.
I think it’s a little like the old saying about locks (“locks keep honest people honest”). A gentle reminder will generally help remind a responsible dog owner to be responsible.
But a-hole dog owners gonna’ a-hole dog owner. I’d probably treat those as the exception (as I do now with my own lawn) and, grudgingly, just pick up the poop.
ETA: Correction. I generally wouldn’t let him poop on a yard with THOSE signs (above), but I would NOT let him poop in a yard with signs like this
So it depends on which message you’d prefer to send.
Or some of those that say the lawn was sprayed with poison and to keep away. I’d think that would work way better to discourage people from letting their dogs even near the grass.
What about the poop is causing the problem? Is it being left behind or is it killing the lawn? Generally, poop that’s picked up doesn’t hurt the lawn. It’s often pee that causes the grass to become sick or die.
I’d leave out the word “poison” for legal liability reasons. Just posting that it’s a “treated” lawn might be helpful.
The trouble is, most dogs don’t read.
I think it is unclear if the dogs pooping on the OP’s lawn are running wild or with a human walking with them.
If the latter then the best course is to confront the human.
I assumed these were dogs left to run about on their own.
Dogs connect scent with territory claims. I would use something longer lasting like those waxy laundry scent beads - and just sprinkle them around the perimeter of the whole property. Then I would put up a motion sensored alarm in a very high pitch. Calibrate it carefully to go off if an animal crosses your scent line.
You haven’t given much detail, so I’ll just note that raccoon poo is very similar, and nothing deters those critters.
We humans keep dogs. Them dogs gotta poop.
We humans tend to clabber up together in close communities. Them dogs still gotta poop.
At a certain time in a humans life they buy a house and decide lawn care is uppermost in their minds. Them dogs still gotta poop.
Somehow you’d think we could mesh these things where it would work for human and dog. 
Here’s an idea:
That post with the humorous “poop fairy” sign reminds me of a cute but effective sign I saw which applied to hygiene practices (of humans ,not dogs.)
In a public restroom. the exit door had two handles, each labelled with a sign and an arrow pointing to it.
“Use this handle if you washed your hands”
"Use this handle if you didn’t ".
Maybe you could do something similar for dogs. Build a little doggy fun-spot. Maybe a hoop to jump through, or a plastic ramp to run up and down. And put a sign next to it :“the use of this play area is for good doggies only!–the ones who don’t leave poop on my lawn.”
Illustrate the sign with a photo of a cute dog in the arms of a smiling owner.
Using good humor and smiles makes people happy, and might work better than ,say, putting up a sign threatening people with fines.