It reminds me of the time a friend of ours went on holiday and left his dog with us for three weeks. She had a mange problem and her claws here overgrown awfully making her limp. Plus she was so starved for attention she cried and barked constantly. The very next day after he left she was booked into the vet and then into our local dog groomer shortly after. he came back to a spotless, fluffy, energetic little sweetheart, he fur was even growing back!
We went to visit him a month later to discover she had a new kennel, new blankies, new diet...and got a daily dose of attention. I feel many people don't realize until they really see what a change a little love can make.