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.
Foreign bodies such as plastic, fabric, string or bolus (a form or ball of of expired dog food) can cause a strangulated canine bowel obstruction, most commonly in small intestine. These materials sometimes get stuck in the gastrointestinal tract at one end of the oral cavity or somewhere else in the tract, which may hinder the passing of food and ultimately result in strangulation.