@Rebel - Full blood workup including full Thyroid panel (full panel no just what the normal vet workup that is not a full thyroid panel)... as they say make sure that he is in good health. Also what are you feeding him? How much total are you feeding a day? Also with reducing food, add veggies to his food to fill his belly... green beans are good to use... I use Cauliflower and Broccoli... Note also that low normal is typically too low for Basenjis.
@nick4 Sounds like an allergy or something biting him. For sure the vets and see what they say. Benadryl for sure, as far as I know it does no harm if you dose correctly.
EL D (who will be 6 this December) sleeps (I think) most of the day while I'm at work. In the evenings when the weather was nice he would run around in the yard until it got too dark but now he generally just sits in his bed or on the couch if I'm involved in something, otherwise he's throwing his toys around or snooping in the basement.