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Call your dog over and let him see the treat in your hand. As you close your hand, say "No!". Let him lick and sniff, but do not give him the treat. When he finally gives up and backs away, praise him and give him the treat.19-Jan-2018
To teach your dog what "no" means, start by showing it 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 it and give it a treat from your other hand.
When we say “no” to a toddler or a dog, it usually means “stop what you're doing right now” but a dog doesn't know that. It knows you're not happy – your body language and tone of voice will convey that. But as far as we know, it doesn't realise why and it certainly doesn't know how to respond. … Ditto for dogs.
Teach Your Dog To Say “Yes” Move your fist up and down in a very slow motion so he moves his head up and down watching the motion and then give him the treat. Repeat a few times. Next, practice without the treat in your fist and give him a treat from your other hand. He will learn that the fist is the signal for “yes.”10-Jun-2015
The “no” command is one of the basic commands in dog training. The “no” command can help stop your dog from engaging in unwanted behavior.24-May-2021
0:061:46How to Discipline a Puppy (Safe, Humane but Effective Methods)YouTube
When you play with your puppy, let him mouth on your hands. Continue play until he bites especially hard. When he does, immediately give a high-pitched yelp, as if you're hurt, and let your hand go limp. This should startle your puppy and cause him to stop mouthing you, at least momentarily.
There is nothing wrong with using the word “no” properly when training your dog. “No” should be said calmly and should mean, “That is not a behavior that I want.” “No” can also be a “no reward marker.” It can just mean that the dog will not get a reward for that behavior.