No don't worry,your only doing it for his good anyway arnt you? Cats have ways and means of making you feel guilty, putting that little face on when they see the box. The stress will set in when your late for your appointment and your little monster is hiding under the bed where you cant reach them. Or you have to chase them around the house about 5 times before you catch them, leaving you like a big sweaty angry ball then going to the vets like that cos you haven't got any time to fix yourself up again, its not nice I tell you!