Striders turn into Moa's at about level 6, then back to striders at about level 11. I tamed a Strider when I was level 5 and it was level 1. It leveled up to about level 4 while i was still level 5, and from then on it usually levels up not long after I do, remaining more or less the same level as me.
My bf however had a Stalker of level 5 when he was level 5, and it reached level 6 before he did. As long as you take your pet out everytime you go out (I do, my bf does but it usually dies and he doesn't take the comfort animal skill so can#t res it) and mine has stayed with me, whereas his has now dropped a level below him, me and my pet coz it stays dead so much
