Hi Everyone. I'm Lou Castle and I live in Los Angeles. I'm a retired police officer who was a K-9 handler for my department and then the in-house trainer. I now do dog training seminars and have a few private clients. Mostly I work with police service dogs and SAR K−9's but I also work with pets. I've been in dog training since 1979. My favorite tool is the Ecollar. I know that will make me unpopular with many but I've never been interested in how many people like me or don't like me. I use whatever tool/method is appropriate for the dog I'm working with and what I'm teaching.