It is certainly possible to teach your dog to pee in the shower, but it might take a bit of time to do so. You will need patience and a lot of positive reinforcement to ensure that you’re okay with your dog peeing in the shower.
Most dogs are taught that they’re not allowed to pee in the house and therefore they might feel like they’re doing something naughty if they’re told to do their business in the shower. However, they will get more comfortable with it as time goes on.
One thing to consider is that once they know that they can pee in the shower, they might begin doing number twos in the shower as well – you’ve been warned!