serve trick

[claudekennilol]

The animal companion trick, serve, do I pick someone when I pick the trick? Or can the designation change and just one person at a time can be "it", and teaching the trick again allows me to designate more people at a time?

[claudekennilol]

No one has any thoughts about this?

[Matthew Downie]

"Serve (DC 15): An animal with this trick willingly takes orders from a creature you designate. If the creature you tell the animal to serve knows what tricks the animal has, it can instruct the animal to perform these tricks using your Handle Animal bonus on the check instead of its own. The animal treats the designated ally as friendly. An animal can unlearn this trick with 1 week of training. This trick can be taught to an animal multiple times. Each time it is taught, the animal can serve an additional creature you designate."

I'm pretty sure you have to designate the person being served during training.
"An animal can unlearn this trick with 1 week of training." Why is that there for this particular trick, if not to allow for the fact that the trick becomes permanently useless if you no longer want the animal to serve that specific person?