Earlier this week, pet retailer Petco announced that it would stop selling shock collars which are a painful aversive used in dog training. In this blog post, I include the statement - in full - by the Pet Professional Guild which endorses and praises the decision. Please: if you are on a Facebook group or with a dog training club where a shock collar is recommended, speak up against their use. Studies show that positive reinforcement is the better option for dog training.