My dog has a build up of fleas that seem tobe literally eating his back end right above his tail and it's so bad he's bleeding, we have tried dawn, vinager, flea shampoo, and ointment, we don't want him in pain so we can't use certain products, and we live below budget. What could i do to help him pls?

I'm sorry to hear that your dog is having so much trouble! Fleas can cause a tremendous amount of discomfort, especially if he has an allergy to them. You can get a tablet called Capstar over the counter that will kill any fleas on your dog every effectively within 30-60 minutes, so this would help to give him some immediate relief. It only lasts for 24 hours, so you will need to start him on a longer-lasting medication as well to prevent them from coming back - the most effective products are oral medications like Bravecto or Nexgard, which you can get from your vet. Depending on how severe his skin problems are, he may also need prescription medication such as an antibiotic and anti-inflammatory medication to treat the bleeding sores - for this, he would need to have a vet exam. I understand that costs are a concern, but this should not be an expensive visit at all - just the exam fee, and you can request written prescriptions for the medication to be filled at a human pharmacy. The medications themselves are very inexpensive.

I would discuss a biopsy with a vet. It could be a combination of all 3, and a biopsy will be the best way at trying to diagnose the disease process rather than trying a bunch of treatments that may or may not work. If it really is an allergic-type process, then often dogs need a combination of hypoallergenic dog food, good-quality flea preventatives, and immune-suppressive medications.