Doug Kanter said:

Correct. It's called civil trespass, wherein you allow or cause an
unwanted substance or object to enter your neighbor's property. It's
a great law for when you need to deal with such things as chemicals
carelessly sprayed by neighbors, or with the low-life owners of
unleashed dogs.

Which segues rather nicely into the "Neighbor's dog pees thru fence"
thread...

--
Bob
Kanyak's Doghouse
http://kanyak.com