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Hello. I'm sorry to hear about your dog.
That dark bile look to the urine worries me. I'm worried about an issue with the liver. This could be hepatitis, a liver shunt, an obstructed gall bladder or even a Lepto Infection. Bloodwork would be the first step. Often times we'll need an ultrasound to rule out gall bladder disease. To confirm Hepatitis or Lepto, we need a liver biopsy or Lepto blood titers.
With limited finances, I would just run the bloodwork and then put him on an antibiotic combination like Amoxicillin + Metronidazole. I would also put him on a liver supplement like Denosyl. I would do this for 1-2 weeks and then recheck things. Many non-specific hepatitis dogs will do quite well on this therapy and be back to normal within a few days.
I hope this helps, let me know if you have any other questions.
I would switch from Pepto to Pepcid AC (Famotidine). You can give 1/2 of a 10 mg tab every 12 hours. It's safer on the gut.
I'm located in Kalamazoo, MI