I had an aussie mix before, had no issue house training. She left our family 2 years ago, and now we have added a 13 week old lab mix. She was kept with some dog groomers for awhile until we got her, often staying the night at the shop for over 12 hours, so i know she had accidents. We have had her 3 weeks, and yes, we got a crate the first day we got her. I have done the usual, always keep an eye, take her out every hour or so. She will potty outside, get praise and a treat as soon as we come in. But she still uses the bathroom inside the house, sometimes right in front of us, but mostly when we cant see her. I keep most doors to the house closed, but we do have a decent sized house, so if we sit down for dinner, she can go into the living room. It isnt bladder, i work from home and she will sit in my office with me for 3 hours and lay, sleep, chew on a toy. But take for example last night, we went on a long walk with wife and kids, went to playground, tossed ball around and played for about an hour, came back, and she did nothing while outside. Within 30 minutes of being at home, she peed twice in the house. Maybe i was just spoiled with my old dog, but after almost 4 weeks, she knows that she should potty outside, she gets praise when she does, but continues to potty inside.