What a cold response when you consider the fact that they took on a loan to help the poor dog. I see no reason to disparage them.
If they were rich, this would make sense. But they had to BORROW the money. That is very BAD STEWARDSHIP.
When an animal comes up lame or seriously injured, the HUMANE thing to do is put it down.
Even PETA gets that.
That is still no reason to disparage them for their act of kindness and free will decision to help. The dog is expected to make a full recovery and is now a beloved family pet. It is their money and their own decision to borrow the money to help.