Came here to say this. I have an Aussie and he really does not care about food. They just want to run and do stuff, food is secondary. I've never needed to use treats to train him either. Good boy and a pat on the head suffices.
I'm guessing you both have very well fed dogs, and that is why they are often not food motivated.
My cattle dog will be begging for food and giving me all the looks that she's hungry, but if I put a bowl of food down and then grabbed a ball she wouldn't give the bowl a second glance. I can't even give her a treat for bringing the ball back and dropping it, she's too focused on the ball. As soon as I put the ball away, she'll do anything I want for the treat. I think she considers the ball her job and it overrides anything else.