A Histiocytoma is a growth that develops on the surface of a dog's skin. Histiocytomas are benign, non-cancerous nodules, commonly known as round cell tumors.

Actinomycosis is a type of bacterial infection caused by a variety of Actinomyces species bacteria.

A flea allergy, or flea allergy dermatitis, is an inflammatory response to flea bites,

Fleas are parasitic insects: they live on the skin and eat the blood of their hosts.

Itchy skin, or pruritus, is a common symptom of multiple conditions. Scratching, rubbing, licking, and chewing are the most common signs shown by itchy dogs.

Atopic dermatitis (or atopy) is a common allergic condition in dogs that is similar to human environmental allergies (hayfever). Determining what the dog is allergic to is rarely necessary for management of the disease, but examples of common dog allergens include pollen, dust mites, and mold spores. 

A moist, inflamed, red, weepy, clearly defined spot on a dog’s skin is often referred to as a hot spot.

Contact dermatitis refers to inflammation of the skin in response to an allergen or irritant making physical contact with a dog’s skin cells.

A dog may obsessively lick and chew themselves, objects in their environment, or towards nothing in midair.

Seasonal allergies are a common condition in dogs. Most seasonal allergy symptoms in dogs result from exposure to flea saliva and/or pollen.

Canine allergies are common and occur when the immune system overreacts to allergens the dog is exposed to.

Lymphadenopathy is enlargement of the lymph nodes, and is a common finding in many diseases, illnesses, and conditions.

Cutaneous lumps are lumps within a dog’s skin which make a nodule, raised area, or discoloration on the surface of the skin.

Ear mites (Otodectes cynotis) are a contagious parasite that live in the ears of their hosts. This parasite resembles a small tick, but is much smaller; too small to distinguish with the naked eye.

If a dog tilts his head involuntarily or chronically, especially when along with other symptoms like ear pain or lack of balance, it may be a symptom of an underlying medical condition

Food allergies occur when the immune system overreacts to an ingested protein.

Foxtails and other grass awns, are a common form of seed dispersal for many types of grass. Awns have numerous bristles that allow the seed head to embed in the skin and orifices of animals and their shape makes them difficult to remove

Solar dermatitis is a condition caused by exposure to UV rays, which leads to irritated skin, rashes, and potentially cancerous growths.

The anal glands (AGs) are two small glands situated either side of the anus which produce secretions that are deposited on the feces during normal bowel movements.

A claw disorder is a disease or trauma which affects the claw and surrounding tissue. There are several disorders that fall under this classification including traumatic injuries, Symmetric Lupoid Onychitis (SLO), bacterial and fungal infections, tumors, and keratinization defects

Sarcoptic mange is a specific type of mange that occurs in dogs with an infestation of Sarcoptes scabiei - a parasitic mite that burrows along the surface of the skin in places with sparse hair including the outer ears, abdomen, and elbows.

Demodectic mange occurs when large numbers of Demodex mites infest a dog’s skin. When small in number, Demodex mites are considered a normal part of the canine biome.

Cheyletiellosic mange, or walking dandruff, is an uncommon parasitic infestation of Cheyletiella sp. mites in dogs.

Mammary gland tumors (MGTs) result from the uncontrolled growth of mammary gland (breast) cells, which group together to form lumps in the mammary glands.

Hair loss, or alopecia, is characterized by hair loss leading to bald patches and places in the coat that are abnormally sparse.

Squamous cell carcinoma (SCC) is a malignant tumor formed of keratinocytes, a type of skin cell. SCCs are often characterized by the location of the tumor (e.g. oral, digital, etc.).

Lupoid onychodystrophy is an uncommon disease that affects the nails or claws of dogs. Dogs with lupoid onychodystrophy typically have multiple nails on more than one paw affected, but are otherwise healthy.

Mastitis is the inflammation of breast (mammary) tissue. Mastitis in dogs usually results from a bacterial infection and almost exclusively affects nursing mothers.

Eosinophilic granuloma and  furunculosis are skin conditions which manifest in dogs as red or yellow bumpy nodules which can be itchy or painful. They result from skin inflammation triggered by hypersensitive reactions and are associated with insect bites.

Aspergillosis is infection with the fungal organism Aspergillus spp. in dogs. Aspergillus is found world-wide in soil, and does not usually cause disease. In some dogs, especially immunocompromised individuals, eating or inhaling the fungal spores of Aspergillus causes infection,