Here's why:
* Different species: Foxes belong to the genus *Vulpes*, while dogs belong to the genus *Canis*. This means they are distinct species with different evolutionary paths.
* Physical differences: Foxes are generally smaller than dogs and have more pointed snouts, longer tails, and bushy, triangular ears.
* Behavioral differences: Foxes are more solitary and often nocturnal, while dogs are typically social and diurnal.
Think of it like this: Humans and chimpanzees are both primates, but they are different species with unique characteristics. Similarly, foxes and dogs are both canids, but they are distinct species with their own unique traits.