Mia had that on her and so did Murphy once. I took them to the vet and he said it was a form of Staph infection on the skin. An antiobotic and they were all better.
Not sure if that is what your girls have or not but just looks very similar to Murphy and Mias. The Vet I had said it is very common in dogs and passes easy to other pets. They could have picked it up at a park, dog store, etc....
Hope you figure it out Jodie. Hugs to Angel and Sissy!
__________________ Caren, mommy to Murphy and Mia  Murphy WUVS his girlfriend Trixie |