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Spread garden lime all around the yard to kill the fleas
next use a flea wash on the dog
use a flea destroyer spray in the house and wash all dog bedding and mats that the dog lays on
Take the dog to a vet and get a needle to stop that reaction and while there make sure that it is fleas and not mites
If the problem is so acute , then the humans in the house must also be suffering flea bites