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Hi, this is Dr. Gabby.
To help with the itching, you can give him human benadryl. 1 mg of benadryl, per each pound of dog, every 12 hours as needed.
The cortisone cream is fine to use. Apply it every few hours until the itching has calmed down. It is not toxic if he licks it. But, if he licks it then it will not help. You can buy an e-collar at the petstore. That will prevent him from licking.
Fleas do like to bite over the hind end. So he may have been bitten by a flea and he is allergic to flea to saliva. The fleas just go on the pet to feed then jump off. So a stray flea may have bitten him.
Also dogs have anal glands just inside of the rectum. Sometimes those become too full and do not drain properly. This is painful for the dog. So they may bite their hind end or scoot across the floor on their hind end. So if you notice him scooting across the floor then he needs to see the vet to have his anal glands checked.
How does that sound? Do you have any additional questions?