help!

[myhousestinksofdogpee]

We have 3 year old dog who we all love to bits but he keeps peeing everywhere and poos overnight too. We had him neutered just before Christmas hoping it would help but it's not.
We also have another dog who is 8, we have no problems with her whatsoever.
Please can someone give me some tips on what to do.

Firstly get them down to the vets to check there's no physical problems.

1st step vets i agree.

Then toilet training from scratch

Also,have you considered 'crate training'?

Vets and if nothing wrong go back to step one with crate training. What breed is he? Some are supposed to be a bit tricky to house train. I had a papillion who could not hold it because she was so tiny and ended up putting a cat flap in for her.

Thanks everyone.
Will get him in at vets to check.
He's a yorkie chihuahua cross.
We had a crate initially but got rid of it, he has free roam of the house at night as well as day but he's even started peeing on the kids beds, although interestingly he has never peed on mine.
If I did start the crate again would I still let our other dog roam free?
He's a really bad yapper (little dog syndrome) too I can imagine the noise he's going to make in the crate but we can't go on like this.

We have pup crated and older (13yo) dog free and it hasn't caused any tension. I don't think dog psychology us such that 'free' dog would flaunt it. When DH forgot to close the door one night he stayed in and waited for a cue to leave in the morning so it may no longer be strictly necessary but we'll not remove as it is his safe space. He goes into it of his own accord for naps, having been bribed in with kibble in the first few weeks. We just don't have space for a crate for the 2nd dog too. He has claimed under the dining table though.

To be honest we only really used the crate at the start so we could separate them when we weren't there, was worried big dog would eat the little one!

I suspect that his behaviour is probably being reinforced slightly by your reactions - you have to ignore the toileting, clean the area with a biological washing powder and go back to basics with toilet training.

Lots of toileting opportunities outdoors, lots of praise when he goes in the right place, and restrict his access to one room with his bed/food/water overnight

To be honest we only really used the crate at the start so we could separate them when we weren't there, was worried big dog would eat the little one!

Sorry don't know why that posted again.
I think getting a new crate seems a good idea.
Any pointers on getting him to settle in it?
Got visions of barking and crying all night.