If the pup has a flea allergy, they are so sensitive, one bite and all hell breaks loose.
The topical is fine, just keep your wife away from handling him for 48 hours, then you can bathe him in a gentle shampoo, then it is okay to touch the area again.
Just remember to treat the environment too, clear out any clutter, wash all bedding in hot water. Professionally clean carpeting.
Ps: Often you will never see the fleas…..
The symptoms you describe are diagnostic. If he has other environmental allergies, time will tell. In the meantime I would try to trust the veterinarian (health care professional that examined him)
You are going to have to start him on flea/tick and heartworm preventatives soon anyway.
The natural solutions are scams, ineffective and a waste of money.
I hope you are not listening to the homeopathic crowd, dangerous stuff.
