My 2 yr old daschhound has been throwing up bile since last night and won't eat. Last week after giving dried chicken treats he was constipated, brought to vet not obstructed r/o done with rectal exam.

It might just be an upset stomach... or something else.

Have you called the Vet and explained the problem, whether it's new or continuing?

Yes, they said not food or drink and bring him in ia am. I worry small dogs are prone to renal failure.

My dog was not eating very much and vomiting almost every night. We took him to the vet last night and he was diagnosed with lymphoma :( I hope you got better news at your vet appt.