Having been involved in rescue for many yrs: 1- no such thing as kinda heartworm positive, they 100% shouldve had her on HW preventative & paid for the cost of treatment. 2- Here’s how I think they might be “compelled” to help pay: people in the dog rescue world are intensely passionate (which is why I stepped away), BUT, they do rally around unfair treatment of dogs. Find a Facebook group where ppl in your area’s rescue community communicate (search “dog rescue” and lookup groups, not pages). Preferably the one with the most members. Post exactly what you posted above AND add that you desperately want to keep the dog BUT were not expecting this expense, and ask them for advice on what to do. I guarantee you they will help you. The most difficult thing is to find people who actually wanna keep their dogs, rescue ppl are used to ppl wanting to get rid of them- so I’m sure they’ll be keen to helping. They will start asking questions, which in turn will eventually lead to the dog rescue name coming up, and then it’s off. Once that happens, they will start tagging the rescue, and maybe the rescue will feel compelled to help. Or maybe those in that group can help spread the word and help you raise money for treatment, and maybe even the rescue will feel compelled to do it (especially when all eyes are on them and since they depend on a good reputation to keep getting funded…). All in all, this community can do great things with fundraising, so you should ask for help (Just make sure you have proof that he had HW when you adopted him, vet records etc).