It is suspected that cats may be more likely to develop permethrin toxicity because they have different liver metabolic pathways to other species â in particular, they have a deficiency in the enzyme hepatic glucuronosyl transferase. Source(s): http://www.fabcats.org/owners/poisons/pe...
Re: Swallowed chunk of rawhide. In all honesty you need to contact your vet. Rawhides do cause blockages, especially in smaller dogs, because the pieces are too large to pass through the intestine. Contact your vet, and ask for some x rays. Cheapest, and most effiecient way to see if there is a blockage, how large the piece is, and if it is moving through.
How to Prevent Intestinal Blockages: 1  Keep an eagle eye on your pet. 2  Never give cooked bones (they are more likely to splinter), rawhide, or unsafe toys to dogs with a vacuum-cleaner reputation. 3  Keep your dog out of the trashâespecially after a barbeque. 4  Always make sure toys are larger than the dog's throat (and, therefore, impossible to swallow).