<human>: Give me the gist of the text in a nutshell

My sister's dog is really sick. Sister lives with her mom and they have no money to help him get better. I was wondering if Reddit could help me to help the sister with advice, recommendations on free/very cheap animal clinics in the Southeast US, to consider possible diagnoses (because narrowing down what could be wrong with the dog would save a ton of money at the vet on tests and other pointless exams that tack on extra charges), or possible options for treatment that might help the dog... Really, any advice would be greatly appreciated. 

Of course they could always take the dog to the pound and see what they could do but after contacting local shelters, they said there was very little, if anything they could do aside from putting him down. I'd like to give the dog a chance and thought it wouldn't hurt to ask Reddit as one of our last resources. 

Some information about the dog: 

* Breed: Siberian Husky
* Gender: Male
* Not Neutered
* Age: 9yrs
* Lives outdoors with shelter in fenced in yard
* He had all his puppy shots and last shot was a 3yr rabies shot that expires this year
* Medical History: He was injured attempting to jump a fence in 2008 creating an unseen wound on his chest which turned into an abscess that was vet-treated and cleared as fully healed 6 mos later. Other than that, healthy until about 8 mos ago when my sister suspected he might be having seizures. The dog has also come in contact with several feral cats (as he hunts any wild game that enters his "territory"). 
* Recently upon examination, my sister noticed a large open sore on the dog's bottom (under his tail) and she's very worried about the way it looks. This is suspected to be the root of all of the dogs discomfort. In case there are any Veterinarians on here, maybe you can help? Any advice would be appreciated. Obviously it would be best to take him to the vet to be examined but as mentioned, the sister and her mom are struggling financially as there have been recent deaths in the family and they would like to try everything before having to give the dog up or put him down. Thanks Reddit, hope you can help.
<bot>: Sisters dog is sick and cannot afford expensive treatment due to recent deaths in the family. Any advice that might help would be appreciated.