I read this on one of the Message boards over at EQVault, I found it VERY helpful:

"By conning you can always tell within 2 levels what pet is. There are 3 levels of blue con (once your level 16 or above), blue dangerous is 1-2 levels below, blue risky 3-4, blue upperhand 5-6.

Depending on what level you are you can thus determine pet level (i.e. I'm level 21 and pet is blue dangerous, thus he is level 19 or 20). "

I hope someone else out there is helped with these little nuggets of wisdome ;)

Gabreel/Xegony