A lady I worked with 25 years ago had a savannah cat. She said it was a serval, but I think it was a savannah cat. It was huge. She had to put special locks on all her doors, because it learned to open them all. . .
First time I saw it, it was laying in one of those elevated cat tree/bed things in her living room. All if could see was it's head and ears sticking above the edge of the bed. I walked up to pet it and it stuck about 3' arm out and slapped me in the jaw,

. It must've weighed 30 or 40 lbs.