Cavalier King Charles Spaniel - 2yo - marking (and more) inside

[justtry]

I don't know what to do anymore. Still marking in the house, and sometimes even relieving himself in the house.
Can I try re-train? How? Crate training didn't work (maybe we did it wrong?), tried a pee-pad in the house (one of those plastic things you put a pee pad under) - bring him to it, but he ignores it/praise with treats didn't stick. Leaving back door open, he goes out but just comes back in to especially do it!

I have just looked on amazon at doggy diapers... (DC would not be amused!)

Anyone with words of wisdom?

Treat him like a pup. Restrict area indoors. ( dogs don't mess their beds) if he's not in a crate watch him like a hawk and take outside every half hour. Praise like mad when he goes. Get rid of the pads. ( just confuses dog it's ok to go indoors) Don't leave the door open (if he's outside in his own you can't praise when he goes) take out after play, food, waking up. Use a word/ cue when he goes outside. Clean any accidents with enzyme cleaner. Good luck!

Leaving the door open is a mistake as you need to be outside actually praising him for going so first thing is shut the door . You need to go back to basics taking him out every 30 / 60 minutes , introduce a cue word if you’ve not got one ( reinforce it if you have ) and watching him like a hawk indoors . Maybe keep him on a house line so he can’t wander away from you to go . Don’t have pads indoors as it confuses the issue and says to the dog that peeing indoors is ok . Is he neutered ?

Thanks - yes we have a crate. He's neutered!

Sounds like I need to spend some time on this again. I am worried he will just go back to his "lazy" ways after improving first (not sure he actually is lazy, I mean, for him it's probably very normal and he thinks it's okay!), but that's the human take on it! He isn't given the run of the house at the moment - I wish we could without worry!

Has he been checked for a UTI? Inappropriate urination is normally the first sign.

Leaving the door open and using puppy pads will both have confused him massively. He won't understand why one side of a door is okay but the other is not, or why peeing on a certain bit of floor is fine but next to it is not.

You need to go back to basics. Take him out after drinking, eating, sleeping, playing, walks and every half hour when he's awake. Tons of praise and a treat when he gets it right - ignore it when he gets it wrong and just make sure you clean up using an enzyme spray.

Get rid of the pads and leave any doors to outside shut at all times.

I don’t necessarily think you need to crate him , he’s an older dog , you just need to really keep on top of it for a few days at the moment it’s an ingrained behaviour , a house line would be my choice .

Mine (a girl) has been like this but I put it down to us not keeping on top of things properly.
She never wees in the house now we put her out in the garden more regularly and take her for nightly walks (we did, and still sometimes, do twice daily walks but there was no proper routine to it). Now she knows she’s getting the walk every evening she will either go to the front door or scratch the box where her lead is if she needs it before we are ready to take her (so we quickly get our shoes on and take her, or open the back door if we can’t take her at that precise moment).
We did also have to put her in her crate at night again for a short time whilst she got used to the routine, then let her out first thing in the morning (if she woke up before us and started scratching her crate we would go and let her out)
Basically, once she was getting used to letting us know she needed to go out, we were quick to respond