He's never growled or scratched us, but he will go into absolute trauma if you touch his paws.
His nails, when we got him, had never been clipped. They curled 2x around like a paperclip.
He clicked when he walked on the floors inside.
Two of us tried to hold him. Not possible.
It took months to trim one paw. Finally, cruel as it appears, we learned we can wrap him tightly in a towel, like a Cat Burrito & clip those nails while he squeaks & squirms.