I am not a scientist, but I don't think permethrin is as dangerous to animals as the indicate on the label. I purchased a much higher concentration from a feed store. This level is supposed to require a chemical license. IIRC, The bottle gave instructions on the label for applying directly to animals such as dogs, chickens, live stock, as well as treating kennels, barns, chicken bedding, etc. Once dry, it poses no health risk to humans.
That said, I don't recall any thing about cats.
Also, the chemical license requirement for my bottle (for all farm related chemicals in quantities or strengths not available to the general public) is usually more about environmental hazard of the product tha human hazard. The labels tell you that very time. Ex. If it spills in a waterway, if it spills on food crops
Works great on roaches, house flies, yard bugs, and about any creepy crawly, even the good ones unfortunately. I usually spray my house inside and out about 2x per year to keep the bugs down.
I've never treated my clothes but have treated my bugnet and hammock.