It's normal. I used to have two who were similar, except they outright hated each other at first. Eventually they grew to a sort of begrudging tolerance, but they were absolutely never friends for the ten or so years they lived together.
My indoor only cats will sometimes greet one of the strays in the window. Lately, she's started rubbing the window kind of aggressively (video attached). Is that... good...? It doesn't seem negative, but it's not a behavior I usually see in her and it's very forceful, so I'm not quite sure what...
Unfortunately, I don't think there's really anything that you can do other than keep the cat indoors. So if that's not something you're willing to do, then it's just a risk you have to accept. I can sympathize though, I used to have an all black cat who just loved to roll around on the asphalt...
lol, Mine did that! We weren't outside, luckily. We were at the airport in a backroom waiting for the security people to run the carrier through the scanners, so we were all right. But now I know, I can NEVER trust my boy on a leash; he is far too high strung and skittish. Some cats do very well...
tl;dr: Do I need to wait until I've brought this stray cat to the vet for shots before I let him into my house with my other cats?
I live out in the country currently with my two indoor only cats. There are numerous pet and feral cats in the area, and we regularly leave food out for the feral...
I've heard of this kind of thing enough anecdotally to believe it's normal. My sister's dog changed her behavior too when my sis was pregnant. She just got super protective of her all of sudden. I can only assume that pets must be able to sense the pregnancy somehow. As long as Gizmo is behaving...
I welcome it if it means they'll shut up in the middle of the night! lol
But seriously, I do allow it and actively encourage them to sleep in our bed. My girl Miko has developed this habit where she'll walk around meowing constantly until I call her over and lift up the covers for her. She goes...
We've always had some hair issues because our cats *love* eating my long hair. I try to clean it up when it sheds, but they usually get some anyway. So, lately we've been trying a number of different things to control hairballs/hair in feces, including cat grass. They are super into it! But...