I have, as of today, incorporated quite a large amount of weapons in to my pets as well as pet scaling based on Rebirth if you're above 0 Rebirth and Charisma if you're 0 Rebirth.
Pet Menu and Items that you may equip: http://prntscr.com/1ym9ke
Rebirth 1 Magician Pet: http://prntscr.com/1ym9dg
Rebirth 100 Magician Pet: http://prntscr.com/1ym9tc