I have a 2 year old female husky, Nanook, who isn't acting like her normal self. She normally bounds around the house and yard, comes in the living room and will lay down at my feet, stretches out in the breezeway (her room) for naps, and occasionally gets zoomies in the yard. For the past 5-6 days she has done none of that. She still eats and drinks, which is a good thing. She has hoarded her toys in her kennel, where she spends 98% of her time unless eating or going out to potty. We have done nothing different with her, except we put some of that flea medication down her back. We have used it before and never had this reaction to it. Any advice is welcomed. Thank you all in advance.