I have recently bought one of those electromagnetically operated cat flaps
as my house seemed to be turning into the local drop in centre for all the
cats in the neighbourhood.

My cat has always worn a collar, the type she has at the moment is one of
the ones with the safety catch fastener that comes apart if the cat gets
stuck on anything.  My problem is that the magnet which operates the cat
flap will not fit over the safety catch on the collar.

I don't really like the idea of a collar with a buckle as there are a lot of
trees where I live, and I don't think I could take the stress of worrying
that my cat had hanged herself while I was at work.  Are there any other
types of collar that are safe for cats.  I have seen the elasticated type in
the pet shop.  Are these safe? Or does anyone know where I can get a collar
with a very small safety catch.

Jeannie