Here is a list of pet commands that you can use, a few do not work here, but most should. these commands are for a charmed pet, not the summoned one.
https://everquest.fanra.info/wiki/Pet_commands
As fas as a pet window there is not one on P99, however what you can do is what most of us do. The box that has who, invite, disband etc, as well as combat , skills and a social page.
What you do is the last tab the social page has pages 1 - 10 , the page 1 has preset macros on it you can keep those, and use another page for your macros or just change those.
Right click on any little box , at the top give t a title, then the default is white and hard to read, so change the color to blue, black etc one you like.
Then on the lines below type your /command like /pet attack and save, for /pet attack macro, I recommend on line one typing /pet back off, then on the next line below that type /pet attack and save.
you basically use the social age to create a pet control window by creating macros, yu have room for 12 commands per page. which for me 12 commands on one page to control pets is plently,
Also make a pet break macro, so your group will know your charmed pet has broke, and you may need a fast stun or taunt, heal etc until you can stun mez and recharm.
most use the lvl 4 mez to recharm pet breaks as it is low cost, fast cast, and doesn`t keep the pet mezed out of the fight for to long.