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Top 5 Causes Of Itching In Dogs

Dogs can become itchy and begin to scratch for many different reasons. However, allergies of various types are among the most common causes.

Canine Flea Allergy Dermatitis
An allergy to fleas is one of the most common reasons dogs become itchy. When a flea bites a dog, it injects a substance into the dog’s skin which causes the allergic response.

For a sensitive dog, one flea bite can make the dog extremely itchy.
One of the most difficult things to understand is that often no overt evidence of fleas is present even though a flea allergy is the reason for the dog’s discomfort. This inability to find evidence of fleas stems from the fact that only one flea need be present and bite the dog in order for the allergic reaction to occur.

In addition, dogs frequently groom themselves and remove the evidence of the fleas through their grooming behavior. Therefore, not being able to find fleas does not rule out a flea allergy as a cause of itching in a dog.

Canine Atopy
Canine atopy is a type of allergy that causes a hypersensitivity reaction to environmental stimuli, such as dust mites or pollens. It is a common disorder in dogs and typically causes scratching and itching. Finding the source of the allergy in these cases can be challenging.

Food Allergies in Dogs
Food allergies are another common cause of itching in the dog. Food allergies can result from reactions to any ingredient within the food but beef, chicken and wheat are some of the most common culprits.

Bacterial Skin Infections in Dogs
Bacterial infections in the skin, commonly called bacterial dermatitis, are another common cause of itchiness in dogs. Bacterial skin infections frequently occur as complications to canine allergic skin disease and are usually a secondary disease.

Bacterial dermatitis must be successfully treated with antibiotics in order to evaluate and control the underlying allergic skin condition.

Canine Yeast (Malassezia) Skin Infections
Yeast skin infections most commonly involve a specific type of yeast known as Malassezia. Like bacterial skin infections, yeast infections are generally secondary to another underlying disease, often allergic in origin. Antifungal medications, such as ketoconazole, are needed to treat canine yeast infections.

Most Common Causes of Itching in Dogs
The three most common causes of itching in dogs are flea dermatitis, atopy and food allergies.

Any of these three types of allergies can be complicated with secondary bacterial or yeast invaders resulting in bacterial and/or yeast skin infections in affected dogs. These skin infections can become quite itchy in their own right and cause extreme discomfort and distress for the infected dog.

Less commonly, other causes, such as canine ringworm (dermatophytosis) or sarcoptic mange may cause itchiness and discomfort as well.
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