"Paul" wrote in message ...
Ralph, If I taped the photocell, then my sprinkler will get turned on all
day instead of only when it detecting the dog,
Beside the motion detecter idea I doubt that it's going to work for this
purpose because whenever people walk
by it will get turned on too.

The motion detectors have a photocell to detect the light and a motion
detector to detect hot moving objects.

Time to have a talk with the neighbors about their animals. If no response
from them, then animal control or traps.