A lack dog and a brown and white dog run on a gravel surface with something red underfoot .
There is a very good chance that a black and a brown dog are playing around on a gravel surface .
There is a very good chance that a black and a brown dog are playing around on a gravel surface .
It is probably not the case that a black and a brown dog are playing around on a gravel surface .
A black and a brown dog are playing around on a gravel surface .