Neosporin works on bacterial infections not fungal ones so you can probably stop that.
Info on ringworm here
http://www.lbah.com/ringworm.htm
and here
http://www.marvistavet.com/html/body_ringworm.html
Oral fungicides and some topical ones are contraindicated in pregnant dogs.
As she is pregnant you need to work with your vet on this issue for the highest level of safety for the fetuses she is carrying.
In other circumstances miconazole might be used but I would not sugget using that without conferring with your vet.
You might want to ask the stud dog owner if that dog is having any issues.
Your other dog might have the problem or might not. Sometimes contagion depends on immune system. If its ringworm you could get it too.
Hope this helps you!
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