Why is my dog's rear end dark and she keeps licking and scratching?

Question

My dogs rear end & vaginal area are darkening. She's scratching, biting & licking herself non stop. What could this be? Pet's info: Dog | Chihuahua | Female | unspayed | 7 years and 9 months old | 10 lbs

Dr Stafford, BVetMed, MRCVS · Accepted Answer

She may be coming into heat which could be causing her to feel irritated down there, making her scratch which damages tge skin barrier and can cause skin infection. Or alternatively she has simply got a skin infection. The skin does look inflamed and the dark pigment could just be natural colour change or it could caused by yeast. She looks sore so I would have the vet examine her and determine exactly what microbes ate present in the area and then decide how best to treat. She may just need an antinflammatory or antihistamine but I suspect she will also require an antimicrobial.

Why is my dog's rear end dark and she keeps licking and scratching?

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