So I have a temp cat now, Mittens. My friend Pixie, who is her real owner, had to sell her house and move. Plus a lot of other things happened to her and it became rather difficult to take care of a sick cat when she already has two other cats. So I volunteered to take care of Mittens. Now that Pixie has moved into her new place, she can look after Mittens, but there's no real urgency to so I've kept Mittens with me. Besides, the cat has to be medicated twice a day and it's just easier for me to do that since I have no other cats. It's really great to have a cat again.
Pixie doesn't have her cats wear collars but if Mittens is going to be with me, I prefer that she wear one in case she goes missing or something. I got her a really cool looking collar that brings out the dark brown in her fur very nicely. I also had her microchipped. I have her registered with HomeAgain.
On their web site, HomeAgain claims to be the only service that sends out a lost pet alert to vet clinics and shelters when a pet is lost, and allows for immediate access to the pet's medical information. Mittens is enrolled in this particular service, mainly because that's what she got when I took her to a local shelter to get chipped.
I doubt that Mittens will ever go missing (she's an indoor cat), however, it's my belief that it's better to err on the side of caution. You never know what can happen.
If you've got a pet, you have to be responsible for its well-being. Even if it happens to be a temp cat, a loaner kitty here to get nurtured back to health.