[Lomac]

My friend has a dog that's more or less house trained. When it's unable to go outside due to weather or other reasons, it knows to do it's business on a specific mat in the house. However, when it's left alone it tends to go to the washroom basically where ever it wants. As a result, it's hard to teach the dog "no" when it's being shown after the fact. It's not that big of a deal to clean up after it, but I'd like to be able to have it properly trained... and I'm not quite sure what steps to go through in order to do this.

Any suggestions?