Right now both trinkets and pups seem to just sit in your account. It would be interesting to have some sort of pup care mechanic. Perhaps trinkets could be collected as toys for pups. Playing could use energy, which would create a reason to feed pups. It's a bit weird they don't eat until they're adults right now. I'm not really sure what sorts of rewards would be associated with this mechanic, since it would require time and resources. Maybe some kind of affection system?