Lost cost vets

Hey everyone. My mother is disabled and is recently having financial issues, her number one concern is her dog. Im reaching out to see if there are any low cost/sliding scale veterinarians in the west palm area that could help her with things like lower cost visits, monthly flea/tick/heartworm pills, etc. Perhaps if there were events where those services were offered more affordably.

It is her service dog and he is in genuinely great health. But as we all know those heartworm pills add up. I am helping where I can but she'd be happy with more independence. Thanks for any leads.