Tips for training a dog to give a signal that they need to potty?
Until now, I've been SUPER lucky -- all my rescues have a way of letting me know when they need to go outside to potty. My newest little guy had a tough start to life - he was bought by a man & kept in 1 bedroom of the guy's apartment, when the guy got sick the roommate dumped the dog at the shelter. We don't know if he ever even went outside (I know some small dog owners litter train or only use wee-wee pads).
My older dog will go to the door & scratch at it - the new guy doesn't seem to let you know at all that he has to go out, you turn around & there is a mess on the floor. We do go out regularly, and he is now 1yr old (we've had him 4 months) so we're not dealing with a little puppy that can't hold it at all, but I would really like to teach him to give me a signal he needs to go out.
I'm just wondering if anyone has any tips for teaching a dog to give a cue that they need to go potty -- such as my older dog that will paw at the door.