Ok so I need ideas/help on a strange problem from wise SN mums.
My boy (severe asd,LD) has a cat phobia.
Every time we go round to see grandpa, who had a lovely old ginger cat, my boy would freak out and refuse to even enter the house until he witnessed big sis pick up poor cat, and ostentatiously lock him in kitchen.
Well very sadly the cat died a week ago. 
So now he won't come in at all - as he does not understand my reassurance words like "cat gone FOREVER" or "cat dead".
My DD point blank refuses to buy a toy cat to pretend to lock in kitchen (she loved the old cat).
Any ideas most welcome!
It is funny in a way, but also dangerous as he is so petrified he would run into street to escape if I wasn't holding him.
TIA