My cats are indoor only!!!!! It is so dangerous for them outside.My sister has a cat that goes outside but he comes home several times a day.No offense but he is a mix.He is not an expensive cat.Not only is it dangerous but you have a Siamese.Someone could could steal him/her.How long have you had your cat? Anything could have happened.Another animal could have attached the cat,the cat could be hurt or trapped.I will say my prayers.Keep us posted.