The story of Sevka reminded us: when we came to the country, the neighbors lived on the site picked by them from somewhere from the washing of the cat Murzik. So this unnatural black-and-white miracle of very small sizes (in the eye - kg 6-7, and not thick, namely, a powerful cat) considered not only the neighboring area, but also our neighboring: he freely entered us (sometimes directly into the house, while allowing himself to chew) and chased the cats who entered there from our site (even tried to drive out our same red-and-white Persian named Bert!). Cats fights with his participation were held at us several times (usually he won). As a result, he damaged Bert's eyes and, apparently, feeling bad, we tried not to get into the eyes. Invisible and contagious.