It really could be just about anything. It could be flea bites, or any type of insect bite. It could be the result of an allergy.
Unless the dog is over run with fleas, I wouldn't think my first impression would be flea bites.
Hondo Von Dopplet L Bauernhof "Hondo"- GSD
Lilie's Tug McGraw "Tug" - Golden Retriever
Maggie - Mini Dachshund (Rescue)
Lonestar - Texas Blue Lacy
Funyon, Ashe, Soot - Barn Cats
Scooter /1/2 Arabian, Shadow, Katie / APHA