I had the same problem with a neighbors dog.
I picked up the mess with a shovel and hurled it into their yard and against their house until they got the message and stopped the nonsense.

the bb gun is the best way. had troubles with 2 of the neighbors dogs. it did not take more than 2 times for the dogs to realise that my yard = a little pain.
reslut, no more canines

my old man used the bb gun method. I 2nd its effectiveness.

scent trick
 

get a funnel
put in empty gallon jug
pee in it til full

establish a border
ie territory
yours
with your own urine

works every time

I think it would be easier and more effective to just piss on the dogs head and send it home with a bag of their own crap tied to their collar. Why ruin a perfectly good beer drinking apparatus on a mutt?

agreed
 

that is actually a warm weather method/solution

as dogs can categorize 500 different scents...

it is there language....

it is our only way to speak dog