Putting things in their mouths is what dogs do, lol. But if you are specifically working on a particular thing, like not chewing shoes, you will want to make sure she understands this.
However, doing a negative reinforcement (which is what you are asking about) is not nearly as effective as positive reinforcement. If she is chewing shoes and you catch her and say "No shoes" (no yelling, just say firmly) and she stops chewing, say GOOD GIRL!! and give her lots of pats. Immediately give her something good to chew, (nylabone, treat, etc) and tell her again, GOOD GIRL! Positive reinforcment is more fun for both you and the pup.
I try to stay away from the word no unless it is in connection with a behavior, like above. Otherwise, I am saying NO all the time, and if they don't connect it, after a while it's not even heard. Last night Wosie was digging on my handmade quilt to make herself more comfortable. She gets absolutely FRENZIED when she does this. I noticed I was saying NO too much, so I clapped my hands and said STOP. When she did, immediately I said OH GOOD GIRL, and petted her. The next time she did it, I just said STOP and she did, and I praised her.
Our pups only want to please. Praising tells them we are happy with them, and will change their behavior positively. Try it! It's FUN!
