Puppies must learn what they can chew
Q: I would like to put down a blanket on the hard garage floor for my 8-month-old puppy to sleep on. But everything I put down, I find in my yard, torn up. What can I do?
A: Normal dog behavior (“play”) consists of digging, barking, play fighting, play hunting, chasing and especially chewing. Unfortunately, many of these normal dog behaviors are not considered normal when living in a home. Chewing is perhaps the least desirable. Dogs like having things in their mouths. They use their mouths like we use our hands to manipulate and feel objects.

Pet Docs
Dr. Perry Jameson and Dr. Henri Bianucci
Dogs enjoy chewing on objects just as their wolf counterparts would chew on the bones of animals they had eaten. It is an inborn behavior, one they are going to do, and it is up to us to teach them what they can (and cannot) chew on and when.
When teaching dogs to perform or not perform behaviors we desire, we must remember they only do things they were taught or that come naturally. How we respond to whatever our dogs are doing reinforces their behavior whether in a positive or negative way. We must also remember they do not have the vocabulary we do and communicate as much through our attitudes and body language as much as the words we speak.
An example would be your dog barking every time someone comes to the door. You may think she does this because she is afraid of the person. To stop her, you reassure her each time by speaking in a sweet, soft voice, telling her everything is OK. Your dog does not understand what you are saying but rather learns every time she barks at someone at the door she gets your undivided attention. She interprets this as a good behavior of which you approve.
We cannot expect puppies to already know what is OK to chew on and what is not. You must spend the time to teach them, and you have to be consistent.
Puppies should never be left unsupervised until the appropriate behavior is learned. When left alone, they should be put in a crate to avoid bad behaviors. When in the appropriate-size crate (one in which they can turn around easily), it is uncommon for them to chew on their bedding. Crating insures you are present when they perform any behavior that is important at this stage.
When puppies perform an incorrect behavior while we are away and they are not corrected, they learn that it is acceptable. When they misbehave, you must be present to correct them immediately and then show them an acceptable alternative. An example would be a sharp loud “no” when caught chewing a slipper. Immediately take the slipper away and give him a chew toy and praise him when he chews on this.
You need to remember to reward all appropriate behavior just as much as you correct bad behavior. In this way, the puppy learns what gets a positive response from us and what gets a negative response.
It is important to have plenty of safe chew toys available. Never give old shoes or socks (or anything that when new you would not want chewed up) as toys. There is no way a puppy can learn to differentiate between an old and new shoe.
Spanking or physical punishment should be avoided. This is more likely to teach the puppy to fear people rather than to not perform a certain behavior. Dogs love to get our attention and, more importantly, our approval. A stern, “no” is more affective than a spanking.
It is important to catch them in the act and to correct them within five seconds. Animals do not remember what they have done, and punishing minutes later will only confuse them and teach them to fear you. Once you have made your disapproval known, it is then just as important to get them doing an appropriate behavior and give them excessive praise. By correcting their bad behavior and praising their good behavior, we can teach them to live in a house with us instead of destroy it.
Dr. Henri Bianucci and Dr. Perry Jameson are with Veterinary Specialty Care LLC. Send questions to petdocs@postandcourier.com.
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Article source: http://www.postandcourier.com/news/2012/feb/12/puppies-must-learn-what-they-can-chew/