You're a great person Beloz, not many people would go that far out of their way to help a dog And it's definitiely a shame that the owners were so ignorant and ungrateful, at least you know that you saved them from a miserable cold night and did all you could.
When we lived on a property a few years ago we had a staffy cross show up on our doorstep, he was riddled with fleas, had no hair on his back from scratching, and his stomach was red raw from rubbing it along the ground. We were on our way to work when he showed up so we gave him a pat but had to leave him to get to work and we figured that being in the country, people let their dogs roam and that he would find his way home. We got back home later that day and he was still there, so I gave him a bath with flea shampoo and gave him some dinner. Took him to the vet- no microchip, so I called the RSPCA but they said they couldn't take him as they don't collect strays, regardless of the hair loss from fleas and that I had to take him to the pound, by this stage I was convinced he had been dumped (we door knocked the area and nobody knew him) so I didn't want to take him to the pound and have him be PTS! Anyway, fastforward 3 weeks, he was still sleeping on a comfy bed at the doorstep of a night (we didnt have a fence and he would get off when we tied him up), he no longer had fleas and he was getting nice and healthy and happy because he wasn't so bloody itchy all the time!!
We had pretty much accepted that he was dumped and that we would just keep him and then my partner took a different route home from work and noticed a 'lost' sign about 15km from our house. We called the number and it was his owners. They came out to collect him, and he was very very excited to see their 2 little boys, was jumping all over them and licking their faces but the parents weren't thankful at all, I gave them the bottle of flea-shampoo and the flea collar I had bought him, got a quick mumbled 'thanks' and they were off. I wished that I didn't have to give him back to such horrible people who let their dog's fleas get that out of hand (theyre not that hard to control) but he was just so happy to see his 'brothers'. I really really hope they used the flea collar and shampoo and realised that it's not that hard to keep the problem under control. But people definitely can be ungrateful when it comes to other people going out of their way to save their animals.