Well, the fact that he's still intact with adolescent hormones and a male dog housemate certainly isn't helping matters any. Hopefully the marking will subside once he's neutered, but he has had two months already for it to become an ingrained behavior.

I suggest you get him neutered immediately ... and the rat terrier, too, if he's not neutered already. Also, buy a blacklight and a good, enzymatic cleaner formulated specifically for pet urine stains (I prefer Simple Solution). Use the blacklight to locate all of the urine spots (urine glows under blacklight in a dark room). Then closely follow label instructions on the enzymatic cleaner. You will need to pretreat any spots that you have already cleaned with another type of household cleaner, or the enzymatic cleaner won't work properly.

If you can eliminate all urine odors with liberal use of the enzymatic cleaner, and once your boys are both neutered, there's a good chance that you'll be able to curb the marking behavior.

Good luck,

Laurie

Yes, getting him altered should help. Peeing issues may mean an infection. Your vet should check for that.

I have some questions. How often do you walk your dogs? Do you walk them seperately or together? How often is the walk and what is the walk like (long meandering get to sniff everything, short to the point just outside and back in? What do you do when you catch your pup marking? How do you handle it?

Get 'em fixed, more then likely that will take care of the problem. We have a Min Pin that we procrastinated on neutering for a year. Finally came to a head when he started marking on people! Once he was fixed it only took about a month for him to stop.

General rule of thumb is one month to break the habits devolped, for every year the dog is left intact.