In our herds, we all strive to produce a rabbit with zero faults, making the perfect rabbit. However none of us have that rabbit yet.
Rabbits with severe faults are going to produce rabbits with severe faults. Depending, of course, on the rabbit he or she is bred to. It's okay for each of our rabbits to have a fault. All of my rabbits have faults. I bet all of yours do, too. But all of our rabbits shouldn't have one severe fault each.
I'm not saying that a rabbit with a severe fault shouldn't be bred. Of course there are exceptions to everything. A rabbit with a perfect body and head but has ear control and horrible weak ankles shouldn't be avoided. Ear control and weak ankles are severe faults. Yet perfect bodies and heads are hard to come by.
A couple of my rabbits have long front legs and weak ankles. This is a severe fault. But those rabbits also have huge heads and amazing bodies - the best of my herd. Since I'm improving in those areas, I'm only letting it go for now. It's something that I'm greatly trying to improve. This next year I will be bringing in new rabbits hopefully that have strong, short bone. It's the most important thing I need in my herd.
Here's a list of all the faults and severe faults in the ARBA Standard. I hope this helps your herd as much as writing this will help mine.
BODY: Body lacking depth; long, low, or narrow shoulders; chopped, pinched, or undercut hindquarters; large dewlap in does.
HEAD: Pinched muzzle; flat cheeks; narrowness between the eyes.
EARS: Thin, narrow ear openings; pointed, folded, poorly furred ears; ear length which does not balance with the size of the head.
CROWN: Lack of strongly defined crown; crown not positioned just behind the eye; narrow side to side or front to back crown width.
FUR: Thin, silky, long, harsh, woolly, or extremely short fur.
BODY: Low head mount; long or narrow body; flat shoulders; dip over shoulder.
HEAD: Narrow or long head; head too small to balance with body.
CROWN: Ear control.
BONE, FEET, AND LEGS: Long or fine bone; weak ankles.