Our expert says:
It can be very difficult to detemine the aetiology of the scratching. You appear to be dealing with the problem correctly - flea treatment, treating the environment etc. I would however advise that you do not wash the dogs to frequently as this can dry the skin and may educe the efficacy of the flea treatment. I would also change the flea treatment to advocate/stronghold as these products tend to treat more conditions.
It is difficult to specificy what plant could be causing the problem as animals react differently to different plants. If you are very concerned and the problem is unmanagable then I would advise having a skin scrape/hair brush examination/taking a blood sample or doing an intradermal skin testing to determine what the allergens are. Please also discuss the use of antihistamine/cortisone to control the skin irritation with your vet
Have you changed the dogs diet?
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