Hello, sorry I didn't see this thread earlier.

Hyperthyroidism is fairly common in cats. I've had 2 cats develop this. the first one, I didn't realize there was a problem until he'd had it for some time. He was on the pills for about 4 years before he died. The second cat was much older when she developed it. She was on the pills for about a year and died of something totally unrelated. It CAN be controlled with the pills.

So sorry to read about Hagrid's cancer. I remember Emeraldgreen's Tiger, and yes the Transfer Factor would be a great thing to try.

Let us know about these bald spots that Hamish has developed.

I love that photo of your boys on the stairs, in the dappled sunshine.