I don't have a dog, but our back garden is fenced. In the UK, the majority of properties have fences, unless you live on a farm or you are 'doing up' an old property. It's actually becoming quite popular now to have not just fences but walls all the way round the property, and to have big cast iron gates on the driveway which are remote controlled. Costs a bomb though and it would look kind of silly on our house