Try one of these options:
https://www.google.com/amp/s/dogtime.com/dog-health/34945-turn-cant-afford-veterinary-care-dog/amp
Check also with your local SPCA, Humane Society, shelter or rescue, maybe even animal control.
Perhaps your vet can offer a payment plan.
See if there’s a local vet school who offers affordable or free options.
Or the Go Fund Me site is another option.
#PetHealthandNutrition