The chihuahua does get a lot of canine skin problems.
The chihuahua does get atopic dermatitis commonly. This manifests as an itchy red rash on the abdomen (tummy) the groin, the axilla (arm pit) and the feet. The inside of the pinna (pointy part of the ear) is also commonly affected causing ear problems in the chihuahua.
Atopy in this breed often starts between one and two years of age and typically the problem starts to get severe at around two to three years of age. The dogs typically chew their feet constantly, lick and scratch the abdomen and groin and scratch at the ears if they are affected.
Typically the skin rash is on the hairless parts of the body. You can find out why here
Food allergy in the chihuahua can be recognised as constant scooting due to an itchy bottom and blocked anal glands and typically chronic ear infections which started in the first year of life. Find out what to do about food allergies here
Demodex mange is common in the breed between 4 and 9 months of age. This will initially present as bald patches (alopecia) which are usually not itchy. See our blog post about Demodex mange for a more detailed analysis.
Flea allergy in dogs will be seen as an itchy rash on the lower back and the base of the tail.
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