Q. Excessive itching,redness under arms and on chest, had sentinel and frontline. Haven't changed food. What us it?

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A. It sounds like allergic reaction. You must be patient to exlude all possibilities - it can be a time consuming diagnostic process. To find out the allergens blood or intradermal test should be done. Before that other causes of skin disease should be rule out ( like infection, parasites). See your vet if your dog scratchs a lot to get oral drugs that will alleviate symptoms.

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