My puppy was fascinated by puffballs. I used to take her walking through a meadow near my yard when she was a few months old, and we would come upon several of these every time.
She was tiny and probably weighed less than some of the puffballs we encountered. She jumped a distance longer than her body length the first time she popped a puffball. She sprang backward, ran forward to it, and retreated before actually touching it.
She did a little dance around it, barking and pawing at it. She found that every time she touched it, a little more brown stuff puffed out.
Ever since that day, she has sought out puffballs to play with on our walks. She is the first dog I have ever known who would rather hunt a fungus than an animal.