
I have now had 7 generations of dogs, even some of the unaffected ones sires had cysts but so far only one of mine has had cysts, and didn't start getting them until she was over 5 years old, so we still have two here younger than that.
I believe they are also quite common in OES and GSD, but can occur in most breeds and non breeds.
Inters tingly my OH has just had one removed that had been on his jaw for over 4 years, but recently become more annoying and a devil to try and shave around.
In people they are most often found in men, and it does seem male dogs are more prone too.