My schnauzer gets this. I took her to the vet and they said it is "schnauzer bumps" common in schnauzer. Here is some info from a schnauzer web site. Maybe yorkies get it too since both are terriers?
SCHNAUZER BUMPS: "Schnauzer bumps" or schnauzer comedone syndrome, is a condition affecting schnauzers that produces pus filled bumps which are most often located on the Back of the dog. It is an inherited condition present throughout the dog's life and there is no cure. However, there are some things that have provided relief to dogs with this problem.
1. Use a dandruff shampoo, such as Selsun Blue, or one called SeboRx, available from your vet.
2. Keep your dog in a stripped coat or clipped very short.
3. Use vitamin E daily.
4. Bathe dog on a regular basis.
5. If allergy related, try changing food. Try avoiding foods containing "corn".
Some breeders have found that sunshine seems to improve this problem. Schnauzer comedone syndrome seems to be less of a problem during the summer months.
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