I do totally agree about dogs running free and someone getting bit or injured. We will escalate this if we have to, the city is going to have the city attorney send letters to those not abiding by ordinances.
We have decided to give the ultrasonic repeller a try as a back up as it may take awhile for law enforcement to get this resolved as they give some warnings with fines and then impound the animals.
Thanks for the replies, if anyone actually uses the ultrasonic repeller we would like to know your experience with the product or any tips. The scarecrow sprinkler will not work for placement in our yard.