WebMD states that there are several diseases that can cause a dog's hair to fall out in chunks, such as growth hormone-responsive alopecia, hyperestrogenism and hypothyroidism, which are all hormone-related. Non-hormone-related diseases for hair loss in dogs include acanthosis nigricans, which mostly affects dachshunds, as well as color mutant alopecia, demodectic mange, pressure sores and ringworm.Know More
Patchy hair loss is particularly evident in hypothyroidism and hypoestrogenism, according to WebMD. The former is accompanied by a thin coat. The latter is accompanied by scanty hair growth and smooth skin and occurs only in females that have been fixed. Hair loss due to growth hormone-responsive alopecia occurs symmetrically and then only at certain times in the dog's life and in certain breeds.
WebMD says that parasites are the most common cause of patchy hair loss. For instance, ringworm can cause hair to fall out in chunks while also producing scaly, red circular patches on the skin. Demodectic mange, an immune deficiency disease, results in patches of hair loss, especially on the face. Color mutant alopecia is a disease that not only results in patchy hair loss but is also accompanied by pustules. Pressure sores occur in large dogs and result in hair loss because the animals lie down on hard surfaces, negatively impacting pressure points.Learn more about Dogs
Dogs whose coats are made of hair rather than fur are considered hypoallergenic because they are less likely to irritate allergies in the owners, and include breeds such as poodles, Yorkshire terriers, Bichon Frise, miniature schnauzers and shih tzus. The lack of fur on a dog does not guarantee that humans will not suffer an allergic reaction.Full Answer >
Cats lose their tail hair due to reasons ranging from medical conditions to flea infestation to environmental issues. Unless the cause is obvious, the best way diagnose the problem is by visiting a veterinarian to have the cat examined. According to PetMD, tools to diagnose hair loss include blood tests, X-rays and biopsy of skin scrapings. VetInfo states that ultrasound can also be used as a diagnosis tool.Full Answer >
Causes of hair falling out in clumps include alopecia areata and telogen effluvium, as reported by Physician's Desk Reference. Both of these are conditions that can be medically treated.Full Answer >
The Pomeranian breed has a double coat that is considered fur, although fur and hair are often used interchangeably when describing a dog's coat. A single coat is called a hair coat.Full Answer >