Didn't read the article because I don't have dogs or cats at the present time, but sometimes these things can spread even if your animal doesn't have direct contact with others. Ii never had a dog with fleas until I moved to a small town, then my dog got them big time just from being in the back yard (fenced) and with no contact I know of with other animals....they must have just been in the environment....in any case, I hope it dies out quickly.