You can view the pets' attacks in-game by checking the detailed info for each pet power (for their base attacks) and the info for the upgrade powers (for the attacks those add). Or you can get listings over at City of Data (though it lists one or two that they don't actually get, possibly remnants of powers that were scrapped).
No idea about the AI though.
Is there a list somewhere of the different attacks for the different pets? In addition how the pets do them in order?
Example Mercs burst, burst, melee, burst.
Tryin to plan a build and need to know how certain pets handle their attacks and how their AI cares it out.