We crate-trained our 9 week-old Boxer. Within a month or so, he learned to go outside. He has either waited for us to take him outside to the backyard, or peed/pooped on our walks or goes in/out his dog door. All good! UNTIL… this evening. Gustav had been in the backyard to poop, came inside using his dog door. He had dinner, played with his toys. Then, without any warning, he walks into our enclosed sunroom off the living room (where my husband was) and I hear my husband call out “No!! What are you doing?!” And races to the adjacent sunroom to let Gustav outside. They come back in and report to me (I’ve been in the kitchen) that Gustav lifted his leg, peed on the sunroom tile and then peed on the upholstered chair. Whaaat?? Anyone else had this situation with their less than 1 year old puppy? Gustav is now 8 months and weighs just under 60 lbs.