When I was about 17 a totally emaciated alsation wandered into my garden. She was really friendly and starving so I fed her a little food and gave her loads of attention. Later, I called the RSPCA to see if thee was anything they could do as I assumed she was a stray dog. They took her on and I visited most of the next day. It transpired that she was owned by a local poor family who had been feeding her, not abusing her, but she would just have the food run straight through her. Turns out she had a stomach lining disorder, but a special diet and steriods for the rest of her life would sort it. After a couple of months she was back to fine health, and i would spend most days and weekends taking her for walks around the RSPCA grounds, until the day came that she was due to be returned to the rightful owner. Unfortunately he couldn't afford the expensive diet and medication, so to my joy, he let me have her. We had 5 great years with such a wonderful dog with huge personality. She cost a bomb to keep, but was worth her weight in gold, but eventually her illness progressed beyond treatment, and then her back end started becoming paralysed. Eventually I had to hold her as the vet did what he had to do, and it broke my heart for years thinking of that moment. Still does now, 10 years on. Sometimes, an animal is worth the expense, no matter how much it is.