my pet is lvl 4 and 0 exp since he got to lvl 4, it was a long time and i did exp in the meen time, so i gues exp frezez, but i only have 1 pet so cant speek from some expert position.
Maybe some one who has like 1 pet his lvl but at 99% can say pet exp after it hits same lvl as you, dunno.
Btw we are not talking about something like : Your pet was 1 lvl under you with 99% exp and you lvl it up by killing 10 mobs in 1 fight and you got 5k exp out of it so pet got 10% of the 5k and recived 60% exp in to next lvl, we speek about pet gaining more exp after it hit same lvl as you.