Have bards and farmers start the game with a guaranteed whistle.
Add a whistle to the inventory of Bards and Farmers at the start of the game.
Right now one of the main problems people have with pets is that they're a bit clunky if you end up faster than them and it's hard to get them to come to you. Whistles are one of the only ways to get a pet to come to you from far away and they are not a guaranteed item by any means.
So it's a small quality of life change to have classes that start with pets to have a whistle to make it more appealing to play the classes.
It's not like it will make them overpowered or anything like that so I would see no reason not to do this.