My dog is marking all over my house!

[Guinness]

Hi everyone,
I've been having a problem with my dog, Guinness. He's 7 years old, neutered (was at 6 months) and in good health. He was housetrained when a puppy and never marked in the house until recently - when my son started potty training, and our newborn daughter showed up. We caught him marking in the house twice, so he stopped, but then started marking at night when we couldn't catch him (he's clever).
Here are some important details:
- We're obviously a busier family than we were when we got him, so, yes, he isn't getting as much attention as he used to, though we're doing our best.
- We can't crate train him. We tried but he broke out of several crates and is extremely anxious in the crate - he definitely doesn't see it as a den.
- He's always been an anxious dog - has always separation anxiety issues, though his destructive behaviour was curbed back when we got our second dog, Gryphon (female lab/border collie, 6 years old)
So, can anyone offer any suggestions? If you have ANY ideas I'd be thrilled!
Thanks!

[the gang]

a belly band, and maby a little one to play with brenda.

[Guinness]

Originally Posted by the gang

a belly band, and maby a little one to play with brenda.

Thanks Brenda. But a belly band means MORE "diapers" to wash.
G.

[BenMax]

You are not going to like this but if you tether him to you this will help. I find that this usually 're-trains' dogs and it will allow you to correct him immediately. He gets it - he is just going through a rebellious stage due to a possible change in your home.

Also, ensure that he does not have a medical problem such as a urinary infection - this could be possible as well.

Does he drink more water than usual? Has he lost weight? How is his appetite?

[Guinness]

His health's okay. We took him to the vet in the summer. The nighttime marking had been going on for about a week when we took him and they checked him for any urinary infections.
His eating and drinking is the same. Weight's fine (he's a biggie - about 110 pounds).
Thing is, he only marks at night or when we're not around. I'll go out shopping for an hour, let him out before I go, and will still find a little pee somewhere in the house. Since we caught him doing it in the day and reprimanded him each time (NO!! Outside Guinness) he won't do it when we can see him.
So would the tethering help in this case? (I'd try it, though, if you think it might help.)
G.

[BenMax]

They call it umbilical cord training. This is effective, however if he is doing it only when you are not around, obviously this will not work. I would absolutely do this even at night. I do this with fosters that I get that are not house trained. Though I am almost perpelled into the wall when they get up - it does work. I tell them lie down and they usually go back to sleep.

I do not want to get personal, however can you specify the resent changes...anything no matter how small. Also, does he go often to the same spot?