Wheeled iron pig

Hi all,

Here is one I need some help on. I have seen countless iron farm animals in my travels but I cant remember seeing one with wheels. It is just under two inches from tail to snout, and the second pic shows that it was clearly cast to accommodate the axles. I was wondering if anyone could give me any info on this piece.

The photography stand is a waxed cardboard box that once contained one pint of Pure Cream. Its past is also in question. The third picture shows the patent stamp on its bottom.

Thanks very much for looking

e1