Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

Why is my dog incessantly itching with dark, irritated skin and fur?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua (Smooth Coat) | Female | unspayed | 4 years and 1 month old | 7.5 lbs

My 4 year old deer-head chihuahua, not spayed, incessantly itches and scratches herself. Her skin and fur are now turning this darker, blackish hue; alongside causing irritation to her skin.

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

2 Answers

Most Helpful Answer

Image profile

Answered By Lauren Jones VMD

Veterinarian

Published on June 7th, 2021

I'm sorry to hear that Bella has been so itchy. In dogs, itching can be caused by a variety of different conditions, with the most common including underlying allergies, fleas, ringworm, or mange. When dogs scratch, they damage the outermost layers of the skin barrier, which can lead to the onset of a skin infection. Infections then causes further itching, creating a vicious cycle. The skin on Bella's neck and the inside of her knee do look as though it may be infected. Chronic inflammation, endocrine/hormonal disorders, and autoimmune conditions can all lead to the dark pigment change with the skin thickening that's visible in the pictures. (We call this lichenification and it resembles elephant skin.) The persistence of Bella's itching could certainly lead to such chronic inflammation. Regardless, it's really important that Bella is examined by a vet so that appropriate treatment can be started. Your vet may need to do some skin testing to check for microscopic evidence of infection, as well as checking for mange (caused by mites) or ringworm (a fungal infection). Then, based on those results, they'll be able to prescribe medications to help her feel better. I hope that she's on the mend soon!

Vote icon

1Pet Parents found this answer helpful

Other Answers

  • Image profile

    Answered By Debi Matlack

    Veterinary Technician

    Published on

    Your dog could have an allergy, bacterial infection, even an endocrine condition that needs to be seen by a vet in order to be diagnosed and treated. Your vet will examine her, probably do some labwork, and based on these results, they will be better able to tell you what is going on and the best treatment options.

    Vote icon

    0Pet Parents found this answer helpful

See More Answers

Related Questions

Petco Pet Education Center
Health & Wellbeing
Why is my mouse's eye swollen, cloudy, and has pus?
Is your mouse's eye swollen, cloudy, and pussy? Dr. Melanie, a certified vet, discusses severe eye issues like infection or abscess, urging an immediate visit.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
What fish dog food helps dry skin if my dog eats Science Diet?
Is your dog's dry skin a concern? A certified vet offers expert advice on finding the best fish-based dog food alternatives to Science Diet for essential oils.
Updated on February 04, 2026
Petco Pet Education Center
Health & Wellbeing
My pet is breathing hard, not eating, and lethargic. What's wrong?
Is your rat breathing heavily, won't eat, and has no energy? A Licensed Vet Tech explains potential causes like infection and age, urging a vet visit for diagnosis.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet has red spots all over. What's causing them and what to do?
See red spots on your pet? A certified Petco vet discusses common causes like allergies, infections, or mites, guiding you on diagnosis and treatment options.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet keeps scratching its ear. What's causing this problem?
Is your pet scratching their ear often? A certified Petco veterinarian explains common causes like otitis or infection and how to identify the problem.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My small pet is limping and can't bear weight. Should I see a vet?
Is your pet limping and can't bear weight? A certified vet explains why a suspected fracture needs immediate diagnosis and safe pain relief. Get expert guidance.
Updated on December 04, 2025
image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Book Now

Sponsored