Constant Dog Foul on my Side Land

My street is Chappell Close HP19 9QA (No 73) There are many dogs owner on my street and for the last few years we had issues with dog foul on my side land. Last Weekend 11/072020 i had enough and spend over £400 to put up a fence so dogs can't poo on my side land. This morning 13/07/2020 another incident has happened where the dog poo on the side land outside the fence. (See photo circled in black outside the fence on the soil) The next photo shows Dog foul dated 09/07/2020 before i put up the fence. This has been happening for the last 5 years. This must be stopped, I own this side land and maintain it. This is not acceptable.