Multiattack with a special animal attack

[habibo]

So i was looking at animal companions and the diplodocus at it's second stage as a companion gets the Tail Lash ability witch says it can make two seperate attacks a full round action so with the multiattack ability that it gets as a companion would it then get 3 attacks 2 at full bab and one at -5 or the two at full bab and multiattack does nothing?

[Tyrant Lizard King]

Yes, the diplodocus can make 3 Tail attacks once it reaches that level, 2 at it's normal bonus and 1 at -5. Nice find.