i only let him off the lead in the designated part
i clean up his poo
i hardly see any other dogs at all in there .. certainly not any tree swinging hounds ..
i agree that pavement poo is immensely annoying... i suspect these "delinquent " owners of the "look at me , i'm 'ard"- type dogs are not likely to be carrying a pooper scooper ... rather spoils the image i should think