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My cat's belly has black dots and hair loss. Is it allergies?

Updated On September 23rd, 2025

Pet's info: Cat | Persian | Female | spayed | 3 years old | 10 lbs

Hi, I think there's something wrong with my cat's hair. under her belly, I recently noticed some black dots, and the hair on that area is also missing, I include a picture of that area. Any advice on what to do or what is it would be appreciated. And please, don't tell me to go see a vet, because if I had the time, I wouldn't be asking here. She's a Persian super flat, 3 years old and spayed, has nice and soft and thick hair. Thanks

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1 Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on July 31st, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! It is not possible to know without an examination. This is possibly due to allergies. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. A secondary infection is likely and also needs to be addressed. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

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