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Why is my Chihuahua losing hair on sides & chest with no itching?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | unspayed | 3 lbs

Chihuahua losing hair on sides and chest. No itching no change in food or household.

2 Answers

Most Helpful Answer

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on December 27th, 2016

Especially if symmetric that could be due to an hormonal problem, most likely related to thyroid hormone or sexual hormones (estrogen). Tests for thyroid hormone (total T4 and TSH and eventually free T4) and sexual hormones are recommended in these cases. Sexual hormones related hair loss can be much improved with neutering procedure.

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    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on

    I'm not sure how old Bebop is, but if she is middle-aged or older, it's possible that she could have a hormonal problem such as Cushing's disease or hypothyroidism - both of these illnesses very commonly cause symmetrical hair loss on the sides, chest, and abdomen with no redness or itching. She could also have a skin problem such as allergies or mange - these often do cause itching along with hair loss, but not always. I would recommend having her examined by a vet when you are able to - he/she can do blood work as well as some simple skin tests to help diagnose the problem and get her started on appropriate medication to treat it.

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