My two inside kitties are 4 years and 1 year. They are both male. The eldest had a difficult time adjusting to the transition of the younger one moving in. I can't tell if the outside kitty is male or female. S/he is going to the vet on thurs. I want him/her checked out before he comes into my home with my healthy cats. For now he seems quite content on my patio. My boyfriend lives with me and we are both quite attached to our new friend. I'm just hoping that it won't be difficult for my two other cats to get used to having the stray around. My other two are inside cats but my boyfriend wants to keep the stray outside during the day and inside at night. Are there health risks involved for my two others? They only have their shots for being inside.