I used this product on my yorkie a week ago,now I must point out she is on PB for fits,so Im wondering if its a reaction which I shall find out later as Im off to the vets.My poor girl since having it has constantly,and I mean constantly been scratching,biting,rolling,herself virtually 24/7.She wasnt heavily infested,I saw one or two,and Ive seen nothing what so ever since.....but the poor thing continues to scratch,hence the vets today.I just thought Id post this for anyone else,and will let you know later

Good luck at the vet's.

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Read this: Frontline allergy

You don't mention if the dog has used Frontline before without reaction or if you think that on this occasion the Frontline reacted with the medication. Such questions will be among the first the vet will ask.

Is the dog susceptible to allergies etc?