Example you click on the pet list it shows all the pets as usual, & then on the right side is a menu for last tamed:

I dunno was just thinking about it, noticing the alliance I saw last night had tamed Jadefang while I was on, & it would've been nice if I could've seen exactly when, rather than having a four hour window to work with.
I think it'd be helpful especially if you saw several hunters cruising the same area for the same rare you were after, you could just look up their name & see if they got the pet, & have a time-frame.
I dunno' just a thought; I know it wouldn't fly though cause you'd know exact spawn timers, but I can wish can't I? ^^