Unable to afford preventative treatment…

I have 2 small dogs. One weighs 13 pounds and is 7 1/2 years old. The other weighs 20 pounds and is 6 1/2 years old. I also live in rural Louisiana.

My situation is my sole source of income is only SSI (Supplemental Security Income) now, which is a ridiculously low $966 per month, which is sadly the maximum you can even get.

I can no longer afford preventative treatment, primarily heart worm & flea prevention are my 2 biggest concerns. The only option I found in my area cater‘s only to the treatment of newborn puppies, which doesn’t help at all in my situation.

Can anybody recommend something else I can look into? Unfortunately, I don’t have a very good support system of people to help with while living in the 3rd poorest state in the US.

Thanks in advance!