That depends on the size of the dog and the age of
the dog.

We have two big dogs on 3 acres--they hardly run
any more anyway.

Now when we had the Afghan hound we needed about
30 acres when he was young.

"Donal" wrote

If you look back up the thread you will see that I wrote " I don't
believe that one should have a dog unless one has at least 4 acres of land
for the dog to run around in. "