Frodo has completely stopped chasing and "treeing the cats that live in his household. The cats are so relaxed now that they will sleep on a chair in the same room with Frodo! His owners had indicated to me that he would still harass other cats when they were visiting relatives or if unknown cats wandered into their yard. Frodo obviously had not generalized yet that cats were completely off limits. The same approach we initially used was implemented in different environments. Now Frodo realizes that chasing cats (any cats) LOL is the wrong "game for hunting". Frodo's stuffed animal raccoon, along with the proper usage of the citronella collar were largely instrumental for his rehabilitation. His owners are thrilled with his progress and have promised to give me frequent updates.