A white pony eating hay. 
the pony in the pen
the pony is eating hay
the pony is white
The horse is white. 
Fence surrounding the animals. 
Two ponies in an enclosed area. 
A solid white pony. 
Two ponies eating hay. 
A wood fence around the field. 
The ground does not have any grass. 
a little white pony
a small white horse and a black pony eat grass in a corraled area with fence and dirt ground