One of my level 60 pets has enough experience points to grow to level 61, however, she never does. Normally, I would just assume that level 60 is as high as pets can grow, however, I've noticed that there are a lot of empty slots for moves on level sixty pets and that the proficiency tree has a lot more to offer also. Am I just using the proficiency tree wrong? Is it possible to get more proficiency points without leveling up further? Or is there a way to get pets past level 60 that I haven't discovered yet?

Level 60 is the cap at the moment, but will increase to 75 with the release of the megazone. On my phone at the moment, so typing is awkward, but there's a news post about it in the site news forum that's worth checking out.