* Size: Cats are typically much smaller than dogs. The average cat weighs between 8 and 10 pounds, while the average dog weighs between 30 and 40 pounds.
* Body shape: Cats have long, slender bodies with flexible spines, while dogs have shorter, stockier bodies with less flexibility.
* Fur: Cats have fur that is typically short, dense, and soft, while dogs have fur that can be short, long, or medium in length and can vary in texture from coarse to silky.
* Ears: Cats have pointed, triangular ears that are always erect, while dogs have floppy ears that can hang down or stand up.
* Whiskers: Cats have long, sensitive whiskers on their faces, which help them to navigate in the dark and detect prey. Dogs do not have whiskers.
* Teeth: Cats have sharp, pointed teeth that are designed for tearing flesh, while dogs have blunt, flat teeth that are designed for chewing bones.
* Claws: Cats have sharp, retractable claws that they use for climbing and hunting, while dogs have blunt claws that are not retractable.
* Temperament: Cats are typically independent and aloof, while dogs are often more social and affectionate.
* Activity level: Cats are less active than dogs and spend more time sleeping.
* Lifespan: Cats typically live for 12-15 years, while dogs typically live for 10-12 years.
Of course, there is always variation within a species, and some cats and dogs may not fit these generalizations. But overall, these are some of the key differences between these two popular pets.