My cat is too thin. Could this be a big problem?

It sounds like your cat has developed hyperthyroidism - eating great quantities of food and losing weight is one of the significant symptoms. He needs daily medication to control it. He will die a slowly and painful death without it. Many cats are treated for it and live for many more years. It is not cureable, just treatable.

Please tell your mother that he needs to have a blood panel (with a special T-4 reading) to determine if this is the case and get the medication started as soon as possible.

No. If your cat is neutered, they very often stop producing L-Carnitine which helps with skin elasticity. This is what makes that baggy appearance. You can put him on a neutered cat diet (by Hills) which has added L-Carn. to help the skin tighten up. If he isn't regularly wormed, that might be another thing to consider. If he's old, then a trip to the vet to get his liver checked would be a good idea. Hope this helps.

You mom will love having worms too if she doesn't take it to the vet.

Keep the cat indoors as much as you can to figure it out. I think there are some worming products you can buy without going to the vet.

Perhaps you will only carry your mom to the doctor when it's life threatening too.

At his age it probably is a thyroid problem..could also be a kidney problem but either way tell your mom it is a life threatening emergency..the cat needs a basic blood work done and a check up to what is wrong with him.

Take your cat to the vet please, she may have worms