Hi Trish

I wont use collars because they are dangerous.
What if the cat gets stuck in a bush by its collar?? You will never know and he will be suffering and may even die if he cant sort it out himself. And you would never know other than the fact he didnt come home. I wouldnt even trust these ones with the safety catch on them.
Even in the house they can be dangourous for the same reason. Ok you will see him but if you have been out all day he could have been like it for hours and strangle himself.

Also once my little cat got her paw stuck in her collar as she was trying to get it off. She was horrified by the experience and was panicking and of course was laying on the floor wriggling around