Hi. I’m just a new cat carer and new to this site. Over the past 18 months I’ve been looking after 5 stray kittens. The one I’m concerned about is just a year old but over these past 3-4 weeks has been loosing his fur, loosing a lot of weight and I notice that he’s drinking a lot of water. His siblings now look so much bigger that him. I’ve had them all neutered/spayed. Thinking it may be worms I bought some treatment but it’s difficult to know if he got enough. Any suggestion as to what it could be? It’s breaking my heart to see the lovely fella unwell and I’d hate to think he was suffering. Thanks.