Here are some places that might be able to help you pay vet bills!!!
K9 Of Mine: Here's an article with a list of 24 organizations that can help! (Some listed organizations only operate in certain states/regions so please read carefully!!! Last link on the page is US and UK, the rest are US only, but I'll try to expand on these later <:) !!!)
Waggle: A crowdfunding website where you can register for financial help to save your pet's life, or donate to help save other pets!!!
Plumfund: A free crowdfunding site that allows you to crowdfund for your dog's care, whether you need coverage for vet bills, medicine, x-rays, physical therapy, or something else! (Beware of pages that don't have much info or have weird/unnatural usernames, unfortunately some people take advantage of others' good will by making bots and fake pages.)
PetFundr: Another free crowdfunding site that allows you to make a fundraising post with photos and videos! It's part of a bigger, general fundraising website, but this part of it is dedicated to animals!