What are other causes of canine staph infections due to a skin rash other than allergic reactions?

My daughter's dog (a boxer/collie mix) was diagnosed as having a staph infection. The dog has a rash on her skin but no other symptoms other than scratching. The dog does not have any fleas and is an indoor dog for the most part (goes on walks to take care of business). The vet indicated that if the cause of the staph was not from fleas, something really serious was wrong. We're wondering what else could cause this? The vet prescribed a number of different antibiotics to administer as well as an injection of another type of antibiotic. The dog is approximately 1 year old and appears healthy otherwise. She was also recently spayed.

Staph is a kind of bacterial infection that's why your vet gave you antibiotics. Antibiotics only work on bacterial infections not allergic reactions.Your dog just got an infected scratch or wound just like people can get, and it became contaminated with Staph, just like people experience.Staph is everywhere. It's a very common infection and is generally easily treated if the animal is in good health otherwise.Just be thankful that you got it treated in time because if you hadn't noticed it for a while and it had a chance to grow it could spread to other parts of her body and could become a worse infection that would be harder to treat and could possible cause some damage.Thank goodness that you are an attentive owner.