I had a dog that got hit by a car. He ended up losing his front leg. This dog was a big pupper. Easily 80 pounds. Once he came home, I could not carry him, but my husband could. The dog HATED going potty in the house, so he quickly learned to walk outside with me. Three weeks in, he was walking and jumping down the steps UNLESS his daddy was home. Then he couldn't move. Just sit and whine and cry pathetically until daddy carried him. He got busted one day when he didn't hear his dad's car pull up. Launched himself down the 3 porch steps, realized his dad was right there and fell over hard, crying. But it was too late, the gig was up. However, he continued this type of 'I'm too weak' behavior - but only with my husband - for the next 10 years until he died of old age.