I took him to the vet, his urine was a brown/red color! I freaked out, Rushed there asap. They said that it wasn't blood in his urine so that made me feel better. His symptoms are all from eating the onions(along with the rest of my burger!)
They gave me metronidazole 250mg. It's an antibiotic. I have to take him back tomorrow. They need to check his blood again. He has leisions (sp) on his red blood cells 

Ugh. I'm so upset. I hope he doesn't get worse and need a transfusion!