Out of my 11 pigs I have two boars who live alone side by side because they cannot get along in the same cage. I even had to go so far as to change the C&C cube grid divider to a plexiglass divider with holes drilled in it. Simon was chewing so much he broke a tooth twice. A broken tooth isnt such a big deal in cavies, for their teeth grow continuously. However, I did worry that constant bar chewing might eventually cause malloclusion, or crooked teeth, in old age, so that is why I changed to the plexiglas divider.