To teach your dog what “no” means, start by showing him a treat in your hand. Then, say “no” and close your hand around the treat. Next, once your dog stops sniffing and licking your hand and turns away, praise him and give him the treat from your other hand. Repeat this process until your dog learns to stop sniffing or licking your hand when you say “no,” and then try exercising with the treat on the floor instead of your hand. For more advice from our veterinary co-writer, like how to get your dog to stop doing things when you’re not around, scroll down!