This is equal parts question and vent. I’m a single puppy mom and work full time. I get home at 5pm and take my puppy out. I exercise him, give him mental stimulation and play with him. At 7pm he gets crazy and bites. I thought he was overtired but my mom says he is couped up from being in his crate all day and need more exercise. I don’t know whether to give him a short nap in the crate or take him on another walk. Also as single dog mom it’s exhausting to play him and walk him for four hours straight before bed without taking my eye off of him. I also have to make dinner and eat during that time. I got an exercise pen but he just stares at me and barks when I leave him in there by himself. I need help or reassurance that it gets better.