Hi Mark,
I don't want appear alarmist but I think a slight word of caution is called for. I wouldn't let my lot play with Panic Mouse un-attended. Alfie got the string wrapped around his neck all twisted up whilst playing, it acted like one of those bolas things and the momentum caused it to wrap around several times and become twisted. I noticed straight away but I guess there's a potential for danger there so I'd advise that you don't leave it un-attended, it's perfectly fine if you keep an eye on things though and gives the boys lots of fun playing with it but, IMO, must be treated like other cat toys with string/ribbon etc..
Best Regards
Leigh