I have 4 indoor cats. There are a lot of neighborhood cats. I felt bad for them, being homeless, so I started feeding them. So, obviously, they hang around. My cats don't seem stressed out at all about them. They seem to just peer out the window at the neighborhood cats, and the neighborhood cats seem friendly to them as well. They seem to just be curious about each other. Is it possible for them to be friends? All I read about on the internet is about the strays stressing out the house cats - but I don't see any evidence of that. Is it possible for them to just be curious about each other and be friends with each other? My cats are surprisingly very friendly. I got each one of them, one at a time, so each new one had to be introduced to the old ones...and they always took to each other well. They all love each other very much...I see them groom each other all the time, and play with each other. I don't want to mistakenly stress my cats out, but I really don't see any signs. Has anyone had this experience? Where the neighborhood cats are actually friendly to your own house cats??? Is this possible?