Use Hydrocortisone cream
I've had it since i was 8 and have found that for chronic problems a daily antihistamine works quite well. I've read about other treatments (taking low-dose aspirin daily), but haven't asked my...
Dexpanthenol relieves itching associated with burns, it prevents the skin from drying out.
Antihistamines (diphenhydramine or Benadryl) can help relieve itching caused by hives but won't affect itching from other causes.
Try a flea shampoo or even a anti-icth shampoo for dogs, if this does not work call your vet and see if there`s something else you can try.
How to Treat Insect Bites
How to Treat Itchy Dog
How To Stop Dry Skin In Its Tracks
What Is a Yeast Infection