One of my cats is sick this morning-9 years old,was running and playing last night,is throwing up and can't walk across the floor this morning! Only thing new in the house is a box I got a shipment of yarn in that they were playing in/on last night.. This cat nearly died about 6 years ago from Harts Mtn flea stuff,the kind you drop on,the other 2 were fine then and are fine today..Could there have been something in/on the box to keep bugs out of the yarn?? If so,what? Of course it's Sunday----And of course I have very little money.. Any suggestions.