I assume, that this pen is rectangular.
Look, that 48 = 24 2 = 12 2 2 = 3 2 2 2 2
And know choose these numbers and multiply!
First dimension: 32 x 222 = 6 x 8
Second: 3 x 2222 = 3 x 16
Third: 322 x 22 = 12 x 4
Fourth: 3222 x 2 = 24 x 2
Fifth: 48 x 1
Sixth dimension cannot be integer. So you can for example save this as
48 = 3 16 = 1.5 2 16 = 1.5 * 32
Sixth dimension: 1.5 x 32
NOTE: each dimensions are in feet!