Perhaps you can answer this question for me. A co-worker informed me that all calico cats are female, and that, on the rare occasion a male calico is born, he is sterile. Both calico and tortoiseshell color patterns are sex-linked in cats, so it is true that cats of these colors are nearly always females.
Males do occasionally crop up, and are often sterile.
Dogs like bones, and we like ribs. More folklore says that bones are almost immediately softened by stomach acids, and therefore cause no harm. It is not a good idea to feed bones to your dog. Small bones may splinter and puncture internal organs, but this is not the most common problem I see. I have seen more cases of larger bones obstructing the esophagus, stomach or intestines, requiring surgical removal.