I am quite uncomfortable with the Internet persecution of these people. They do not meet my CF definition, certainly!
A CF is like the woman in the supermarket: OP told her “grab some bits as a leaving present” [clearly meaning under £20] and instead of grabbing a box of chocs/wine, she grabbed a large weekly shop of over £70. The much younger op was embarrassed and guilted into paying. Another CF is the woman who asked a neighbour to help out with school run for a couple of days, neighbour agrees and CF tries to drag the arrangement out indefinitely.
This situ here is so different. People knew who the (famous on instagram) dog and the couple were. They asked for help and it was freely given. The money was spent on a sick dog as intended. No deception or cajoling.
This dog business is internet bullying that comes from envy. There is no CF element.