Boot sizing

I've been home sick with the flu since Saturday night, and so Jasper's had a few days off.  Today I decided I'd go out and do some groundwork and see if I felt good enough to ride.  I didn't.  I kept getting dizzy on the ground, and so decided it wouldn't be safe to ride. 

Today I did want to measure his feet so we can order some Renegade Hoof Boots.  Wayne just ordered a set for Cricket in the yellow gold color, and I'd like to get a set in the spring in either the burgundy blitz or red.

The only problem is, I think Jasper's feet may be too big for even the biggest size!  

Right Front Width: 5 1/4"

Right Front Length: 5"
Right Hind Width: 5"
Right Hind Length: 4 1/2"
After a long hard day of hoof sizing, all Jasper can think about is Shandy and how she's trotting around the arena WITHOUT HIM.  Goofus.