Ooops. Removed pet skill from action bar!Follow

Hello,

Apparently, while I was spamming my pet's "bite" skill, I had moved it off of the pet action bar. Now, I can't seem to find it to put it back!

Is it gone for good? Do I have to unlearn then relearn the skill to get it back? Or, is there an easier way I haven't figured out yet?

Thanks for the help!

hitting P and then clicking on the icon that looks like a slingshot will show all the spells/stuff you pet can learn/has learned (grey is learned)