Need a good dog box

Ol Copper

Eight Pointer
Im looking for a good dog box. Doesn't need to be large as I only hunt 1 feist/cur dog for squirrels, but I may expand the fleet to 2.
Saw a fella at work that had an aluminum diamond plate style box, said it was made in Denton but he didn't have a mfg. name. Looked really sharp but it was huge.

What do you guys suggest ? Open to anything that would work, just wondering if I need to go a little bigger or stay small for now. Never owned one newb here.