Once you purchase a growl rank, you then have to train it. Go into you spellbook, go to the general tab, you should then see "Beast Taraining" go into that and then train all ranks of growl. This goes with all spells you purchase. Growl is probably the most importants as it allows the pet to maintain aggro alot better. Also make sure you train stamina and armor. as well as other ranks of bite,claw,dash.charge ect. Most of the Skills (i.e growl,dash,bite,claw,charge) will be free.. armor and stamina will cost training points.. You get these by keeping your pet happy at all times by feeding it c
