Cats and dogs are considered natural enemies in nature due to their ecological roles and behavioral characteristics developed during evolution. Below is a detailed explanation of why cats and dogs are considered natural enemies:

The natural enemy relationship between cats and dogs
Evolutionary history :
Dogs (including wolves) and cats (including leopards, cheetahs, lions, etc.) have typically been rivals and predators of each other throughout evolution. Their ecological roles and behavioral characteristics have largely shaped their interactions in nature.
feeding habits :
Dogs and cats share similarities in their hunting habits; both are excellent hunters, typically hunting and killing small mammals, birds, and other small prey. This overlap in their diets makes them competitors in nature.
Territory battles :
Dogs and cats are typically territorial in their natural environment, and they will strive to protect their territory to ensure their survival and reproductive success. This territorial struggle can also lead to conflict and competition between them.
Relationships in an artificial environment
In artificial environments, especially under human supervision, cats and dogs can generally coexist peacefully and become part of a family. However, their evolutionary history and predator-prey relationships may still lead to the following situations:
Territory battles :
Dogs and cats in the home may also compete and conflict over resources (such as food and toys) and territory, although this can usually be mitigated with proper training and management.
Behavioral conflicts :
Due to their behavioral differences, such as dogs potentially being troubled by cats' chasing and catching behaviors, they need to be properly supervised and socialized in the home.
While cats and dogs are not necessarily natural enemies in a domestic setting, their evolutionary history and behavioral characteristics can lead to conflict and competition in some situations. However, proper training, socialization, and supervision can help them coexist peacefully.