My advice is to get a breakaway cat collar and adjust it to the smallest size possible. When kitty gets big enough that you can put it on with about 2 fingers going under neath, then its time to put it on. YOu need to make sure you adjust it frequently the first year or so, at least every couple of weeks do a check.
Also look for the most tightly woven durable collar you can find. Some cats are very good at shredding collars and the cheaper ones get torn up pretty quick. Suzie has a safe cat collar that has like a plastic coating. She used to wear another regular safe cat that got shredded pretty quick.
Cookie has a "yuppie cats" collar with an animal print that has a silk covering over it. I bought this one b/c Rocky had a similar one for a long time (over a year
) that held up. He had a walmart collar before that got shredded.
Zakk has been wearing a safe cat collar that is blue with a red ribbon w/ stars over it. He has had it for like two years! Can't remember what he had before.
Rocky has been wearing a lupine collar. I'm not that happy with this one b/c he has managed to shred it a bit. They have a lifetime guarantee. He had one before that he got off, and he chewed on the plastic fastener bit and it cracked. They gave me his new one free. This may be a good thing but it pops off with not much force. He doesn't usually try to get it off, usually zakk pulls it off during play fights.