Well you have to make them care about it. Find out what they love the absolute most and then use it to your advantage. You need to find out what motivates them to do things they might not normally do, whether that be a really yummy treat, or a favorite toy, or a game of fetch or tug.

You may also want to check out clicker training as it lets your dog figure out what you want on its own without you interfering

Clicker Training

Clicker Solutions

Good luck!