Experienced and professional animal trainer provide their insights in answering this question :
A. As it’s a puppy hopefully the hair should grow back without a problem when the adult comes through. Don’t use the harness unless absolutely necessary.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Similar to collars, dog harnesses can cause hair loss too. If your dog`s harness isn`t adjusted properly, or your dog is constantly pulling, they may lose hair around their joints. It`s therefore best not to let your dog wear their harness continuously, and take it off when you get home.
The 5 most common causes of bald spots on dogs include allergies, Cushing`s disease, pressure sores, genetics, and infection or infestation.
In some cases, such as those caused by infections or allergies, the hair may grow back once the underlying issue is addressed. However, in other cases, such as those caused by immune-mediated diseases, hair loss may be more difficult to manage and may not fully resolve.
Topical Treatments May Help with Hair Loss in Dogs

Medicated dog shampoos might help with some hair loss or rejuvenation of your dog`s coat. There are also sprays, ointments, and dips for topical treatment of hair loss. Depending on the cause of your pet`s bald spots, this may be a useful strategy for treatment.

Aloe vera skin gel is another option, but try to use something natural. DO NOT use Vaseline or petroleum jelly on the treated area. It`s not highly dangerous to dogs, but coconut oil is far better—it`s natural, not made from petroleum, and it`s safe for your dog to ingest if she starts licking the area.
A well-fitting harness won`t gap, pull, chafe, or otherwise irritate the dog and will stay put with minimal movement as the dog walks, Schade says. A properly fitted harness also won`t cause rolls of skin to bunch up around the dog`s neck or shoulders, which indicate that it is too tight.
If you notice bald spots, excessive hair loss or other skin abnormalities anywhere on your dog`s body, be sure to speak to your vet immediately, particularly if symptoms are accompanied by itching, irritated or infected skin, a foul odor, or changes in his behavior.
It usually starts out as small areas of hair loss.” This is known as localized demodex. Puppies with demodectic mange—also called red mange—develop scaly bald spots near the lips and on the head or front legs. Oftentimes, the immune systems of puppies will kick in and resolve the problem on its own.
These are symptoms of a condition called alopecia and could be caused by a larger problem, like fleas, ticks, mites, fungal or bacterial infections, medical conditions such as Cushing`s disease or inflammatory bowel disease, hormone imbalance, poor nutrition, or stress.
Shaving can cause permanent damage to the coat, causing it to be unbalanced and unable to provide adequate insulation and protection. As a result, the coat may grow back in uneven patches, have a ragged or unkept texture or may never grow back at all (shave shock).
Sponge bathing your dog with a Borax and hydrogen peroxide solution is a popular treatment for mange. Hydrogen peroxide and Borax together might help resolve the mange mites and heal the skin sores.
Human medications such as Neosporin, hydrocortisone, and Vaseline should NOT be used. Topical creams and ointments tend to cause dogs to lick the area even more, so they should be avoided if possible.
Hot spots are the result of damaged skin that is typically caused by your pet`s repetitive scratching at itchy skin. Itchy skin can come from prolonged moisture (especially on those summer days when water is our friend), fleas, allergies, or areas of increased contact – like from a collar or harness.
Best for extended wear: Ruffwear Front Range Dog Harness

The foam padding on the chest and belly prevents rubbing and chafing, and the built-in clasps are covered with fabric so they don`t touch any part of a dog`s body.

Too much olive oil makes the skin greasy and could provide a breeding ground for yeast and bacteria. Instead, add around 5 drops of olive oil to a cup of water and work this into your dog`s skin and coat. You can do this on a daily basis and if the coat gets a little sticky, blot the excess oil away with paper towel.
Although it`s rare, it is possible for puppies to develop certain types of cancer, so it`s important to have any lumps, bumps, or other changes in your puppy`s skin examined by a veterinarian.
There are two main ways that a dog harness can damage your dog`s joints: by putting too much pressure on the joints or by restricting the dog`s movements. Both of these problems can be avoided by choosing the right dog harness and fitting it properly.
It is related to aging, heredity, and changes in the hormone testosterone. Inherited, or pattern baldness, affects many more men than women.
Ringworm characteristically appears in a circular or ring-shaped pattern on the skin, usually causing the skin to turn red, lose hair, and swell up. Ringworm in your dog may not present itself in such a noticeable manner, so you should keep an eye out for the following symptoms: Inflamed, red skin rash.
Insect bites and stings, medications, plants, chemicals, even shampoos can cause some dogs to develop a rash or hives, which can result in bald spots. Allergic rashes usually appear within minutes to hours of exposure, and other symptoms can include listlessness, fever, lack of appetite, and vomiting.
A lick granuloma (also known as acral lick dermatitis) is a skin condition that occurs due to distress in your dog. This distress can be flared up by stress, anxiety, or boredom. When your dog is stressed, they will start to lick a patch of their skin over and over until it becomes raw.
Mange is a skin condition caused by mites. It typically affects dogs, but some forms can also affect humans. The most common type of mange in dogs is sarcoptic mange, also called canine scabies. Humans can catch sarcoptic mange from dogs, but the mites involved cannot complete their life cycle in human skin.
Allergies

Dogs can develop allergies just like humans, and some of the most common signs are itchy skin and hair loss. The most common allergies in dogs are environmental allergies to irritants like pollen, mold and dust mites, flea allergies and food allergies.

Alopecia areata: This is an autoimmune disorder that causes patches of hair loss on the dog`s body, neck and head without itching. Bacterial infection: When hair loss is caused by bacterial infection, it can usually be traced to a secondary symptom related to a primary condition (allergic or parasitic reaction).

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. How do I get my dog to stop chewing on things? I kennel her when I leave for a few hours, but I can’t go to the mailbox without her eating something.
ANSWER : A. If she’s young, then this is just normal puppy behavior. Don’t worry about it. The thing about puppies is, they explore using their mouths. If your puppy grabs a coat hanger, or a slipper, you should roll up a newspaper, and smack yourself on the head with it for leaving those things out.. your puppy is going to explore things, that’s normal! It is 100% up to YOU to keep those things away from your puppy when your puppy is unsupervised… even for just a moment.

Remember to never scold your puppy for grabbing these things. They are just curious little cuties, and they don’t chew things up to bother us.. Dogs do not have intentional thought, so they aren’t ever doing anything ON PURPOSE to us.. The most important thing you can do when your puppy is chewing something you don’t want her to be chewing is TRADE her the inappropriate item with a toy of hers, so she understands “no honey, that isn’t what puppies chew on… THIS is what puppies chew on!” and then begin playing with her using her toy to show her that TOYS ARE FUN.. Way more fun than a boring ol’ coat hanger.

Another helpful thing you can do is have two bags of toys. In each bag is many different kinds of toys. Lots of chew toys, lots of soft squeaky toys, lots of rope-type toys, a bunch of balls.. All kinds of things! For one week you have bag#1’s toys out for your puppy to play with.. At the end of the one week, you collect those toys, and you bring out bag#2! The toys will be more interesting/feel like new to your puppy, which will in-turn, make her chew less inappropriate things. Her toys are too fun to care about that dumb Wii-mote that you left laying around.

Hope this helps!

Q. My puppy has a bald spot were it looks like his harness rub some of his hair away will the hair come back. Is there any thing I can do
ANSWER : A. As it’s a puppy hopefully the hair should grow back without a problem when the adult comes through. Don’t use the harness unless absolutely necessary.

Q. We have a 4 yr old lab-pit mix we raise from 6 weeks.If my husband tries to take hin by the collar and make him go out to pottie he growls.Problem?
ANSWER : A. This is not good behavior. Rather than take him by the collar, call him to come with you. If he’s not good about coming when called, you can work on that. Keeps treats on hand to to entice him out and reward him when he does go potty and he’ll come to look forward to it. Clicker training is another great way to teach a dog all kinds of things, from obedience to tricks.

Have treats on hand that you know he loves, then simply click and treat. He will come to associate the sound with getting a treat. Start putting distance between you so he has to come to you. Call and click and when he comes to you for that treat, treat him and give him lots of praise. Move to hiding somewhere in the house, call and click. When he comes to you reliably inside when you call, click and treat. When this behavior is consistent, move outdoors with a very long leash. Call and click, if he doesn’t respond, give a light tug on the leash. If he takes even a single step toward you, click, treat and lots of praise. Keep doing this until he comes eagerly. Next, try him off-leash in a securely fenced area. Call and click. At this point he should be responding well and coming easily to the call and click. If he does not, go back to the last step he performed reliably and work on that again until he responds well. Eventually, you can start not treating him every time, but still praise him. Gradually lessen the frequency of the treats until he comes just to the click and praise.

Keep training sessions short, ten or fifteen minutes to start, no more than 30 minutes at a time and do it a few times a day. Try not to do it any time he is overly excited so that he can pay attention to you. Always end a training session on a good note, even if it is just getting him to do something he already does well on command. And never, NEVER punish a dog when they come to you, no matter how far they’ve made you chase them, no matter how frustrated and angry you might be. That teaches your dog that coming to you is a bad thing.

Read Full Q/A … : Causes of Limping in Dogs

Q. My 3 month puppy eats his own poop and is also biting what can I do to prevent this
ANSWER : A. When it comes to poop eating, you want to consider a few things. First off, what is his diet like? Maybe something is lacking in his diet that is causing him to want to eat his own poop. This is the most common reason why dogs eat THEIR OWN poop. Try a higher quality kibble like Taste of the Wild, Ziwipeak, Orijen.. and try feeding three meals per day, instead of the more common two meals per day. Remember to gradually switch his kibble. Add a little bit of the new kibble and reduce the old kibble very slowly.. little by little every couple of days until the bowl is mostly new kibble! You should also be cleaning up his poops IMMEDIATELY after he does them.. I mean like, you have a bag in your hand, and you are low enough to scoop it up RIGHT when he finished so he doesn’t have a chance to eat his poop.

When it comes to nipping there are a few things you can do. First, you should yelp as soon as the teeth touch your skin, stand up, cross your arms, and ignore the puppy until he is ignoring you. Once he is off doing his own thing, swoop down and calmly reward him by playing with him WITH A TOY so he doesn’t nip your hands. Whenever you pet him, or interact with him, you should always have a toy on-hand so you can give it to him. This toy should be a soft braided rope toy that YOU own. This means, your puppy is never allowed to have this toy on the floor, and your pup can never “win” tug games with this toy. This is YOUR toy that disappears when you’re finished playing, and reappears when you want to play. If you keep this up, in a weeks time, your puppy will be so excited to see that toy, that as soon as you bring it out, he stops nipping you because he wants to play with the toy. Another thing you can do is have two bags of toys. Bag#1 is full of chew toys/soft toys/squeaky toys/etc. After one week, Bag#1 disappears and out comes Bag#2. Bag#2 has the same types of toys as Bag#1, and it only stays out for one week. This keeps the toys feeling like new to your pup!

Q. My puppy will be 8 weeks old tomorrow. I’ve had her for a week now, and she still isn’t responding to any training or her name. What can I do?
ANSWER : A. Try clicker training her to come when called. Clicker training is an effective way of training you dog to not only come when called, but can be used to teach a variety of tricks and tasks.

Have treats on hand that you know she loves, then simply click and treat. She will come to associate the sound with getting a treat. Start putting distance between you so she has to come to you. Call and click and when she comes to you for that treat, treat him and give her lots of praise. Move to hiding somewhere in the house, call and click. When she comes to you reliably inside when you call, click and treat. When this behavior is consistent, move outdoors with a very long leash. Call and click, if she doesn’t respond, give a light tug on the leash. If she takes even a single step toward you, click, treat and lots of praise. Keep doing this until she comes eagerly. Next, try her off-leash in a securely fenced area. Call and click. At this point she should be responding well and coming easily to the call and click. If she does not, go back to the last step she performed reliably and work on that again until she responds well. Eventually, you can start not treating her every time, but still praise her. Gradually lessen the frequency of the treats until she comes just to the click and praise.

Keep training sessions short, ten or fifteen minutes to start, no more than 30 minutes at a time and do it a few times a day. Try not to do it any time she is overly excited so that she can pay attention to you. Always end a training session on a good note, even if it is just getting him to do something she already does well on command. And never, NEVER punish a dog when they come to you, no matter how far they’ve made you chase them, no matter how frustrated and angry you might be. That teaches your dog that coming to you is a bad thing.

Q. My puppy has a bald spot were it looks like his harness rub some of his hair away will the hair come back. Is there any thing I can do
ANSWER : A. You should see a vet to check what is going on and why your pet is scratching himself. If problem will be solved hair should regrow after couple of weeks.

Q. My 8 month old puppy is chewing off her hair. She does not chew to the point of raw skin, only the hair. Any ideas?
ANSWER : A. I’d agree with the answer below, and I’d add that with a puppy as young as yours the most common cause of chewing is external parasites and fungal disease. It’s important to realize that almost always, chewing is caused by being itchy. It’s essentially a way that dogs scratch.

The first thing to do is to rule out parasites. Even if you don’t see fleas, treat her for fleas. Use a good product like Frontline – it’s easy to apply (avoid the hairless areas, it should be placed between the shoulderblades. You should also consider that your dog might be getting bitten by mosquitos – a common problem in thin-skinned dogs, and depending on where you live they can still be a problem this time of year.

Your vet also needs to perform a scraping of the skin to rule out mites. And again…even if no mites are found, I would recommend treating for them. They are almost as common as fleas in puppies, and depending on her recent situation (rescued from a shelter?) stress can depress the immune system and cause a mite infestation to take hold.

And finally, ringworm, which is actually a fungal disease, should be ruled out. It’s also almost universally related to conditions, like overcrowded shelters, but it does happen and puppies are more susceptible.

One more note: allergies are possible, but other things are probably more likely at this point. If your vet doesn’t know what to do, I would recommend looking for someone who does.

Q. 2 month old Bulldog. While playing gets TOO rough:gripping hand REALLY tight/growling/shaking to the point of drawing blood. Aggresive?Normal?HELP!!
ANSWER : A. For the most part, this sounds pretty normal to me. English Bulldogs can be like this. What you can do is teach him bite inhibition. He needs to know that biting gets him nothing. Each and every time he nips, even gently, you immediately yelp like a puppy would, stand up, cross your arms, and ignore your puppy. Once he is ignoring you, go back to calmly playing with him WITH A TOY. Remember to always use a toy when playing with/petting/interacting with puppies. They will be teething very soon, and they don’t understand that biting you is inappropriate, so using a toy to redirect their attention is important. He needs SOMETHING to bite, or else he will choose your hand. Give him more options.

Another thing you can do is have a toy that YOU OWN. This can be a soft braided rope toy or something of the like. Dot not allow your dog to have this toy whenever he wants. This toy disappears when you are done playing with him with it, and reappears when you want to play. Never allow him to “win” games with this toy. Eventually, the toy will hold so much meaning, when he sees it, he will be instantly interested in the toy instead of your hands.

It also helps to have two bags of toys. Bag#1 is full of chew toys/rope toys/soft toys/etc. It comes out for one week, and then disappears and out comes Bag#2. Bag#2 has the same types of toys in it. This will keep the toys feeling like “new” to your pup and make him less likely to chew on you during play!