my dog pees in the house

She's well potty trained, and I've known her to be able to hold it a very long time now and then. So when she does it in the house, I am pretty sure she is doing it deliberately. I don't know why.

Does your dog do this? Is It because they're mad? because they're anxious?

She's a fairly well behaved dog. I haven't been able to figure out a consistent pattern.

Maybe she's anxious, or maybe she can't find the potty?

My shi tzu sometimes does this mostly when she can't find the potty (we always set up rags around the house where she can pee). So, for example, when we accidentally close the door and she needs to pee, she sometimes pees where she is.

The "deliberate" part, though, always happens when she gets into the bed. I think it's because she just wants to do it, or maybe she just wants to make her presence felt whenever she lies down on the bed. Now it doesn't happen anymore, and now she can sleep comfortably there.

Maybe she's anxious, though about what I have no idea. I don't think it's because she can't find the potty. We take her out to pee several times a day, and when we leave her alone in the house, she never pees on the carpet. When she does do it, and she's sometimes done this when we're not around, sometimes when we're looking right at her, it seems like she does it on purpose, with something in mind.

The closest explanation I can think of is that she gets really excited about something and that's how she reacts.

Ripley's never peed the bed, thank goodness.