I just got a puppy Boxer who is very lethargic and won't eat, He just want to sleep all day. What should I do

Sometimes the excitement of a new home is too much for a puppy, but I don't like the sound of it. If you can find a vet open tomorrow, I would take it in. You will need to be seeing a vet soon anyway for shots.

Please check the sticky for ''What does a puppy need?'' and Housebreaking, https://www.askmehelpdesk.com/dogs/information-articles-our-dogs-expert-labman-53153.html#post251802