My dog is small / my dog is friendly, why can't I walk it off a lead on footpaths, highways and in communal areas on estates?

Question:
My dog is small / my dog is friendly, why can’t I walk it off a lead on footpaths, highways and in communal areas on estates?
Answer:

 We cannot tailor the rules to suit every size and type of dog, so we have made a sensible general rule for everyone to follow.  This rule not only makes people feel safer, but also prevents a dog being involved in or causing a road traffic accident.