Dog not urinating

[FONT=Comic Sans MS]I have a 14 year old Doberman who has suffered a back injury and will not use her back legs. I took her to the vet today, he said he thinks it is just swollen and gave her a Prednisone shot and sent me home with more to take the next 4 days. I told him she had not urinated and he said that with this medicine it would help and that she probably would relax enough to go. She still has not, It will be 48 hours tomorrow morning and I am concerned. I don't want her to go into kidney failure. What can I do?

I know that generally with prednisone, dogs urinate more frequently. If your dog hasn't urinated in 48 hours, that's not normal. Is she drinking much water? In my opinion, I would phone the vet asap and tell them you are really concerned about this.

No, she really isn't drinking much water either. At her appt. today he said her bladder only felt 1/4 full, and that it was probably just that she could not get comfortable enough to pee. I just don't know how long a dog can go without peeing. I tried calling my vet, but get no answer or machine. She doesn't seem to be uncomfortable, but I just don't want to risk her health.

A healthy young dog can hold it for about 24 hours if necessary.

At 14, your Dobie is extremely old and many things could be causing her symptoms.

I know you don't want your old girl to suffer. I would take her right back to the vet tomorrow and find out what is going on with her. Did the vet do any tests at all - blood tests, x-rays?

He did not this time. He said he wanted to try her on this medicine to see if it would work first and that if she was not significantly better Monday to bring her back for further tests. She is getting more active now. I will take her in tomorrow if she doesn't go tonight. Just wondered if anyone had any helpful hints to try to get her to go?

Does more active mean she is up and about?

If she cannot get up, she needs you to help/hold her up to pee...