I like to mix dry food with wet food for my teenager kittens (Wellness brand). I will often leave some kibbles out if I'm going somewhere so they do not get hungry. My kittens drink LOTS of water, from their bowl and the sink faucet, multiple times a day. I also check them for dehydration by lightly pinching their skin and seeing how quickly it settles into place. They never have had a problem with the skin slowly settling which is a sign of dehydration. Are my kittens still at risk for kidney stones from the dry food?