Dawgs and Kats!!
Years ago, the Town of Washington Grove adopted the section of Montgomery County Code that applies to animal control. This now includes both a Pooper Scooper Law and a Leash Law (excepting neutered cats), and an owner must not allow a cat or dog to enter private property without the property owner’s permission (a $100 fine!). You are within your rights to call Montgomery County Animal Control (301-279-1823) when you encounter a dog at-large, a dog soiling your property, or a cat on your property.
However, working out your differences in a “good neighbor” fashion is encouraged. A “good neighbor” wouldn’t call Animal Control without speaking to the dog or cat owner first and a “good neighbor” wouldn’t allow his/her dog to defecate on someone else’s property (including walkways).