How do you pick up your pup in the den?

You can't pick up your pup in the den because there is no hit/bite button when you are in the den. You first have to hunt for small animals like rabbits and squirrels and raccoons and skunks and bring them to your den. Then, at stage 2/3 your pup will automatically follow you out of the den. Hoped this helped!

Follow the tutorial, it will say what to do, also, you can't pick them up in a den, duh.