My husband and I just returned from 2 weeks away. Our dogs were cared for by a friend. About 2 hours after we returned our, usually house broken, mini Dachsund peed in the floor right in front of us. Then a few days later he left a trail of urine as he walked to his bed. Later that same evening he relieve himself in the floor again, after just having gone outside. HELP? Is he OK? How do I combat this?