Wow!!! you have 13 cats at home that's more than I have 5 cats (inside) and 5 cats (outside) and I also have 2 large dogs and 6 little dogs at home and some goldfishes in tank (my hubby's). My hubby and my 2 daughters are loves the animals as same as I do love them. So, anyway I have enough animals to take care of them until they lived for old age. I have 2 white cats look like your cat Snowball but they has their eye color (one blue eye and one green eye) Their name is Simba and Gizmo they are male cats. And I have 2 black cats named Jasper he is male and other is Midnight she is female but old cat and One tabby longhair named Grayson is male cat. All of them are inside because it belong to my daughters (white cats) and 3 family cats to all of us. The large dogs are golden reiever named Peaches is girl and she is older than all of the dogs and Hiedi is the german pointer reciever and 2 tan color dashies mix named Max and Mandy that they are brother and sister. Also I have red mini dashies named Arnie(male)and Ashley(female)and their daughter Anne and the last one is Lou-Lou the Chihuahua (toy). That's all for now.