What's causing my dog's scaly, crusty hair loss on his back?

Question

My 12 year old dog has a large (silver dollar-sized) spot on his back where his hair is gone and it’s scaly and crusty. Any help would be appreciated. Photos attached. Thank you. Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 2 years and 4 months old | 35 lbs

Jessica Keay, DVM · Accepted Answer

I am sorry to hear about your concern for Luke. We can see patches of hair loss such as this from a variety of causes, ranging from allergies, bacterial infection of the skin, insect bites that got very inflammed, wounds, or a fungal infection called ringworm. I would recommend having Luke examined by a vet to make sure this isn't ringworm https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951439 as it can be passed to people. Be sure to wash your hands after touching the area just in case, until you can have him seen.

What's causing my dog's scaly, crusty hair loss on his back?

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