Lack of Hair Growth in Dogs

| August 21, 2010 | 0 Comments

Different animal species present different hair growth patterns, also hair growth patterns vary depending on the location on the body. Some animals show alterations related to the seasons.

Animals like dogs have coordinated shedding cycles. Some breeds, like Yorkshire terriers, have a prolonged growing phase of the hair growth cycle, similar to people. Drug therapy, such as chemotherapy, produces negative effects on hair growth, and these breeds seem to be more sensitive to those therapies; they can even develop alopecia.

These are some of the different factors that could lead to lack of hair growth in dogs:

Hormones: Some will slow down the hair growth process while others will stimulate it.

Androgens: They can prolong the resting phase of the hair growth cycle.

Progesterone: This decreases hair growth rate keeping the hair follicles in the resting phase of the hair growth cycle longer.

Estrogen: This produces fine sparse hair, also makes the hair follicles stay longer in the resting phase of the hair growth cycle.

Thyroxine: This starts hair growth and boosts the new hair growth rate. Hypothyroidism, which is the deficiency of the thyroid hormone, commonly causes slower hair growth rates.

Corticosteroids: This drug slows down the hair growth process by inhibiting the growth of new hair. This type of therapy may produce alopecia, or thinner hair growing from the follicles.

Nutrition: Hair loss can also be a result of poor nutrition.

Protein: The hair growth process requires methionine and cystine. Sparse, brittle and dry hair are a characteristic of nutrition that doesn´t include proteins and calories.

B Vitamins: Pantothenic acid, among other vitamins, is really important for promoting proper hair growth.

Bacterial Pyoderma: This condition refers to bacteria found in hair follicles when their number is excessive.  Some round-shape areas of alopecia appear, or hair will start shedding excessively as result of this condition. Use of systemic antibiotics for three or four weeks may resolve this problem. Dogs with allergies commonly have this condition.

Dermathophytosis: This is also known as ringworm. As a result of this condition, hair will start falling out in spots. In order to diagnose ringworm, some hair samples can be submitted for fungal culture.

If your dog is experiencing lack of hair growth, it may be caused by hormonal imbalance or deficiency. In order to find out the root of the problem, blood samples can be used to determine hormone concentrations.

In the case that your dog´s hair sheds in isolated spots, bacterial infection may be the cause.

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Category: *Hair Growth Main Menu, Hair Growth Diet

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