My front yard seems to be the doggie potty of the neighborhood (no joke!) just about every house on our block owns dogs and when they take them out they somehow all end up in my yard. What works best to deter dogs ?

(Ps. We had to fence in our backyard because the neighbors next door have 2 golden retrievers and they always went poo in our backyard and they didn’t pick up after them! That was an expensive fence we didn’t otherwise need) too bad we can’t put a fence in the front