Why does my dog scratch so much at night?

The two most common reasons for dogs to scratch are fleas and allergies. Though, if you have a hairy dog, sometimes all of that fur can get irritating. Is your dog outside most of the day and only inside at night? It's possible your dog is sensitive to something in your house...dust mites, another pet, the laundry detergent you use on his/her bed, thus only causing him/her to scratch when inside. Your vet could provide more insight into what the cause is and whether or not treatment is appropriate.

Does your dog scratch during the day? If he or she is active and socializing with others dogs The scratching may not be as noticeable , tho when resting it may become more apparent. Always check for flea's and possibly has some underlying allergies.