Hi we have just got a 12 week old kitten. I have bought him a collar-one of the ones that clicks open if there is any obstruction. However after reading some information about cat collars I'm not sure whether I should use it or not? Some websites have said its best not to use them as they can be dangerous. Just wondered what your advice is? Collar or no collar and if so how old does the kitten have to be before he can wear it? Thanks again!