That IS big. A buddy of mine had a rabbit (”Thumper” of course) that must have been 4 or 5. It was huge as well - perhaps 3/4 of that??
One night some neighborhood dogs knocked over it’s hutch and killed it. However, one smaller dog was also dead with claw gouges on its chest. Who knows, but as 12 year-olds we liked to think that Thumper took it out.
Thumper may well have. A buck that still has his equipment is perfectly capable of fending off any predator his own size or smaller. By breeding bucks were harsh with the does. Until they finished and had seizures. We controlled breeding carefully. And kept the bucks far away from each other.
/johnny