Unknown facts

After playing the game for some time already, Ive found myself with an interesting doubt: Why do Pets stop leveling at lvl 61?

Dont know if they get some restriction based on your, and then they can start leveling up again after you do too or what but...

The fact is that I got frustrated(And will keep frustrated if this is so...) that my "Little Black" stopped at lvl 61...After so much time and gold spent I dont think it would be fair to stop at such random number...

Sad Prince about Sad Princess