The smell of urine often prompts dogs to urinate because they use it to mark their territory, find mates, or communicate socially.

1. The Role of Urine Smell in Dogs
Territory Marking: Dogs mark their territory by urinating, and the smell of urine helps them identify the boundaries of their space. When they smell urine left by other dogs, they may urinate in the same spot to cover or reinforce their own scent markings.
The dating game: Female dogs mark their territory during the mating season by releasing sex hormones through their urine in an effort to get males to take notice. When a female is in estrus, a male dog can sniff her urine and respond to it.
Social Signal Transmission: A particularly strong signal transmitted between dogs. They can extract details about a dog's sex, age, health, and social rank from the smell of its urine.
2. Other Factors That Influence Dog Urination
Environmental Stimulation: A dog may feel the urge to urinate when stimulated by the environment, such as seeing other dogs urinate, hearing certain sounds, or smelling specific odors.
Physiological Needs: When a dog's bladder is full, it will naturally feel the need to urinate. In this case, external stimuli are not necessary for the dog to seek a place to relieve itself.
Training Habits: If a dog is trained to urinate in a designated area from a young age, it will form a habit of using that spot as it grows older. This behavior is more related to training and guidance than to the smell of urine.

So, the urine odor is one of the most common reasons which encourages dogs to urine but the dog's behavior also changed due to physiological needs as well as environmental factors and training. You have to associate urine odor with other teaching and correction methods when the dog is being trained not to pee everywhere.