That's because owner Jerry Crawford has his roots in that county, and has named his racing partnership Donegal Racing.
The big gray horse, second in the Blue Grass stakes at Keenland last time out, will be running in the Donegal colors of green and gold.
Paddy O'Prado has been very impressive in training at Churchill; his workout over a wet track on the weekend made the experts sit up.
He's a longshot because he is considered a turf rather than a dirt horse primarily, but if it happens to come up wet on Saturday, look out.
The homes of Donegal will be celebrating if this one comes home!