Here's why:
* Dogs have a larger olfactory bulb: This part of the brain is responsible for processing smells, and it's much bigger in dogs than in humans.
* More olfactory receptors: Dogs have about 300 million olfactory receptors, while humans only have about 5 million. This means dogs can detect a wider range of smells at much lower concentrations.
* They use scent to communicate: Dogs use their sense of smell to understand their environment, find food, and even identify other dogs.
So, while a dog may not be able to "see" a cat through walls, they can definitely smell them, even if the cat is hiding.
Here are some examples of how dogs can smell cats:
* Marking territory: Cats leave scent marks in their territory, and dogs can easily smell these marks.
* Tracking: Dogs can follow the scent of a cat even if they are not directly visible.
* Recognizing their owner's cat: Dogs can learn to recognize the scent of their owner's cat and may even become friends with them.
While some dogs might be afraid of cats, others might be curious or even playful. It really depends on the individual dog's personality and experiences.