Experienced and professional animal trainer provide their insights in answering this question :
A. Hair loss is never a normal sign in a young dog therefore you should take her to your vet to find out what is going on. Hair loss can be caused by several conditions like skin parasites or allergy or more serious like hormonal problems

How to Identify Common Pet Problems ?

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

A dog whose diet is inadequate to meet his dietary needs will have a dull, dry hair coat and often shed excessively. For more information about dog nutrition related to specific conditions, it is recommended that you consult your veterinarian.
Therefore, a dull looking coat will usually be associated with poor health and lack of happiness. Any experienced vet will tell you that this type of coat is a result of poor nutrition. First, make sure you are feeding your dog well and giving him healthy foods. You should also avoid foods that may cause allergies.
Skin and coat changes: Dogs often start to show gray hair as they get older, often around their muzzle and eyes. Their fur can also change in thickness and texture, but dull coats may be helped with certain supplements. As for skin, it can also become thinner with age, and therefore becomes susceptible to injury.
Your dog is maturing – A puppy`s coat can look pretty different than its full-grown one. As your pup ages, don`t worry if their coat changes too – this is because their body is maturing! A part of that is growing into their adult fur. Around 8-12 months old, your pup will get this more mature coat.
Depending on the genetics of a Yorkie`s breeding, he may have a more dense coat or even a wiry coat. Look at your Yorkie`s parents to determine what type of coat your dog will have. A typical Yorkie coat is straight, shiny and silky. It`s more difficult to achieve that with a thicker, dense or wiry coat.
One of those problems is a coat that is overly dry or dull. Instead of looking shiny and feeling soft, the hair will feel rougher and more brittle. In dogs that have darker coats, you may actually notice a colour change, for example, from shiny black to a dull grey.
Whether environmental, illness, hormonal, plain middle life, there is sometimes a subtle or even a major change. Some dogs become more defiant, lethargic, aggressive, and fussy about food, potty habits, and weather or are prone to injury. On the same note, a smaller dog may reach their peak at 5-7 years.
Small dogs are considered senior citizens of the canine community when they reach 11-12 years of age. Their medium-sized friends become seniors at 10 years of age. Their larger-sized colleagues are seniors at 8 years of age. And, finally, their giant-breed counterparts are seniors at 7 years old.
How to Help: Giving your dog a fatty acid supplement can help restore some of the shine and luster to your older dog`s coat. They will also benefit from more combing and grooming and will love the extra attention. If you notice extreme changes to their coat, be sure to see your veterinarian.
Senior dogs are prone to conditions that may require a winter coat, such as arthritis or a weakened immune system. Heat regulation may decline with age, making even a thick-coated dog uncomfortable in the cold.
Key Points: The life expectancy of a Yorkshire Terrier is between 12-15 years. Females generally live 1.5 years longer than males. The oldest Yorkie ever recorded lived to the age of 25.
The Yorkshire terrier`s small size belies its true personality, which is energetic, feisty — and domineering. Yorkies are affectionate, but they also want lots of attention; the breed is a good choice for someone who wants to dote on a dog. Yorkshire terriers make excellent watchdogs.
Another key difference in appearance is found in each breed`s head. The Silky has a wedge-shaped head versus the more rounded skull of the Yorkie. Plus, the teeth are larger, originally intended for catching larger prey. In addition, the ears can help distinguish the Silky.
And if the pH balance does not match what your Yorkie needs, it can be damaging to both skin and coat. Canines have a pH between 6.5 and 7.5. And finding a shampoo that matches this is vitally important for breeds like the Yorkie that have coats of hair. If the pH is off, the shampoo can be terribly harsh.
Eggs are not only a perfectly safe food source for dogs – they offer much in the way of nutritional benefits. Aside from being rich in protein, eggs are also a great source of linoleic acid, Vitamin B2 and B12 and water-soluble Vitamin A – all of which are wonderful for your dog`s skin and coat.
A dull coat is most often due to a lack of proper nutrition. Veterinary experts agree that maintaining healthy skin and a gleaming coat requires a properly balanced diet of quality food. A good diet for your dog`s health includes quality proteins, carbohydrates, fats, minerals, and vitamins.
A healthy coat should be shiny and smooth, not coarse or brittle, and healthy skin should be supple and clear, not greasy, flaky, or bumpy.
Vaseline

It`s gratifying to know that you want to help your dog`s skin issues by applying Vaseline to their cuts, scrapes, and wounds, but it`s a completely synthetic material, and it`s no good for them.

Very large dogs may be considered seniors at 5 or 6 years of age, whereas small dogs aren`t seniors until 10 or 12 years old.” Because of how dogs age, small dogs and large dogs also have different life spans.
While many people estimate the average age at which a dog becomes a senior at about 7 years old, this can actually vary considerably between the ages of 5 and 12.
The average lifespan for small dog breeds ranges from 10 to 15 years, with some breeds living as long as 18 years. In general, small dogs live longer than their larger counterparts, with the shortest living breeds still exceeding the average lifespan of most large breeds.
Just like senior citizens need more sleep, an older dog sleeps a lot when compared to their younger counterparts. On the higher end of the scale, a senior dog can sleep up to 18-20 hours a day, says Dr. Rossman. She estimates that the lower end is probably around 14-15 hours per day.
Coconut oil may improve the appearance of your dog`s fur. When applied to the skin, it can make hair shinier and less prone to damage. This is because lauric acid, the main fatty acid in coconut oil, has a unique chemical makeup that allows it to easily penetrate hair shafts ( 2 ).
The resounding answer is YES, olive oil offers many benefits for dogs. Similar to us, dogs also suffer from dry, flaky skin. Olive oil contains phytonutrients, vitamin E, and omega-3 fatty acids that help keep your dog`s skin moisturized and well-nourished.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. I have a 5 YO Yorkie. She did have a beautiful coat up till a year ago. She is now complete naked except on her head feet and neck.
ANSWER : A. Hair loss is never a normal sign in a young dog therefore you should take her to your vet to find out what is going on. Hair loss can be caused by several conditions like skin parasites or allergy or more serious like hormonal problems

Read Full Q/A … : Leerburg

Q. Does an indoor cat need to be vaccinated every year?
ANSWER : A. In practice, I recommend a feline combo vaccine every year, but will generally start administering every 3 years once they have had their kitten vaccines and 2 additional yearly vaccines. Rabies, is required yearly by law, and if kept up to date can be good for up to three years also. Based on the age of your cat I would give a yearly feline combo and rabies, and then boost the combo again next year.

Q. I have a 13 1/2 year old Shih Tzu. How old is he in dog years?
ANSWER : A. It’s used to be that dog years were 7 years to every 1. Now it normally around 5 years to every year as long as your dog is healthy and kept up with vaccines. So he’s about 68ish in dog years.

Read Full Q/A … : Shih Tzu Age

Q. How do I teach my dog to sit still enough and not move his head while I clip on the gentle leader?
ANSWER : A. Most dogs HATE the gentle leader, and it’s not at all surprising. Would you want something foreign on your face? It’s an uncomfortable training tool, and no dog enjoys wearing it. If you are looking to have your dog behave better on-leash, you should consider tossing out that gentle leader, and using a front hooking harness like the Sensible http://www.softouchconcepts.com/index.php/product-53/sense-ible-harness, or the Sensation http://www.softouchconcepts.com/index.php/product-53/sense-ation-harness harness. These harnesses will eliminate the pulling power of your dog, and put you in control in a positive, and gentle way. Any time your dog pulls, he is redirected until he is facing you. You can practically walk your dog with your pinky.

I dislike the gentle leader because it can cause neck injuries in an avid puller/lunger. You also can’t ever hook a long-lead to the gentle leader and allow your dog to run around because it would break his neck. Another thing I dislike about it, is it discourages sniffing the ground during walks. When your dog attempts to sniff, and the leash is short, his nose is redirected upwards. When you trip on the leash, the head is jerked around and the nose is directed upwards. Sniffing during walks is extremely important. Sniffing = mental stimulation, which will tire your dog out more during your walks. The more your dog lags, or forges, the less he can sniff the ground, and the more frustrated he becomes.

If you’re dead set on using the head halti.. you should be using treats to hold his attention. Place the head halti on the floor, reward him for sniffing it, pick it up, treat him, put it near his face, treat him, lure his nose through the loop, lots of treats, take the head halti off, more treats, lure his nose through again, more treats. Take baby steps going forwards AND backwards so the “game” of getting the halti on isn’t always getting more difficult.

Q. MY Shih Tzu IS 14 YEARS OLD. SHE WILL NOT LIFT HER HEAD UP EVEN WHEN YOU ASK HER IF SHE WANTS A TREAT. NORMALLY WHEN YOU SAY TREAT SHE COMES RUNNING .
ANSWER : A. From what you’re describing I think 2 things are likely. Either your dog has pain in her neck, which is causing her to not want to move her head, or she’s feeling generalized weakness.

Neck pain in small dogs is usually due to disk problems. They get a form of disk disease known as Hansen’s type II chronic disease, where the disk gradually moves upward and presses slowly on the spinal cord, causing pain and weakness.

Generalized weakness can be due to a number of conditions, starting with just not feeling well due to a GI problem (nausea, for example) to something like anemia (low red blood cell count) or heart disease. It sounds very much like your girl isn’t feeling well, and likely need some diagnostics in order to figure out what’s going on. You vet will start with a physical examination and rule out possible neck pain, and then will likely recommend blood work or other tests. If you want to talk to us further we can probably provide more information on a consult, where we can get more details about exactly what’s going on.

Q. Our 5 year old lion’s head bunny has head tilt, and is falling over. This started 2 days ago. He is eating and drinking well. Ears look clear …
ANSWER : A. Head tilt and falling is classified as vestibular ataxia. We often worry about inner ear infections and inflammation causing these problems. If the ears look clear, the problem may be deeper into the inner ear that cannot be seen without an otoscope. If the ears are normal the problem may be neurological. It is important to have him seen by a veterinarian who can examine the ear closely and take a sample to look for infection.

Q. My dog licks his feet and legs and they are turning brown. He is a white dog. Can you help?
ANSWER : A. Licking the feet and legs can be caused by a number of things in dogs including allergies, illness or even stress behaviors. Allergies are the most common in dogs, with yeast infections coming in second. Allergies can cause the area to become red and itching, making your dog want to lick and chew on them. Over time, the area may become stained from saliva, especially in lighter or white-coated dogs. Yeast infections are also common between the toes, and may cause a smelly “corn chip” smell to appear near your dog’s feet. Again, dogs will attempt to lick and chew to relieve the itch. Keeping the feet clean and dry can help relieve both allergies and infections and pet wipes or a baby wipe of all paws when your dog comes in from outdoors may also help. Keeping your dog from licking the space with either dog booties or an Elizabethan collar is also good as it will prevent secondary infection and staining of the paws and legs. If your dog is determined to keep licking and keeping the feet clean and dry do not help, then your vet can help by providing a medication to treat any infection or provide relief of allergies.

Q. I have a 10 year old pug overweight with dry skin and a 5 year old Yorkie with dry skin…..please advise me the very best dry dog food that. Can give
ANSWER : A. I am very partial to the foods made by Royal Canin. They do a lot of research on nutrition, and their foods have very high quality ingredients. They make a food called Small Breed which would be ideal for both a pug and a Yorkie. You can typically purchase that food from a vet, however they also make high quality diets that you can buy in stores like PetSmart. I’d also recommend purchasing a fish oil product that’s formulated for dogs. Dose according to label directions. The omega 3 fatty acids in fish oil is excellent for building healthy skin.