Training pet

I'm a level 43 Night elf hunter with a level 42 nightstalker cat. I want to
train it to bite. I tamed a level 36 crocolisk and have leveled it up to 38
and made it my 'best friend'. I've been told that its biting aspect should
show up in my beast training list so I can teach it to my cat. However,
nothing has happened. How do I get the croc to teach me bite?

Thanks.