Louie is pooping in the house!

I'm having real problems with Louie and his bodily functions. Last night I actually took him for a walk (against the vet's advice because of his severe arthritis) because I knew he needed to go - he hadn't since about 5am in the morning. He did nothing. 2:30 this morning he woke me up to go out but when I took him he didn't do anything. 3:30 he wanted to go out again so I took him and he had a pee. When I got back in I noticed he had had a big dump on the living room carpet. This is the second night in a row but at least the first night it was on the kitchen floor so easier to clean up. I sometimes have to take him out at least five times before he will have a pee.
Is this normal for a very senior dog? For those who don't know he is 14 1/2.

Yes, has had a blood test recently?
The vet says he cant go out to go pee?

Honestly if thats the case and the vet is saying that he is in so much pain that he cant go on a walk to go pee then you might just want to give a think about doing whats best for him.

Sorry if I wasn't clear. Louie can go out but only to the garden. He wants to walk further but I have to restrict him and yes we know the end is near.