General Comparison
In general, dogs are considered more dangerous than foxes. Dogs have been domesticated for thousands of years and are bred to be loyal and obedient. Foxes are wild animals and are typically less social and predictable. Dogs are also usually larger and stronger, making them more capable of serious injury.
Statistics and Context
For example, CDC data indicates dogs were responsible for millions of non-fatal injuries and dozens of human deaths in a recent year, while fox incidents were far rarer. However, not all dogs are aggressive, and some foxes have been domesticated as pets. Individual behavior varies widely based on breed, size, socialization, and training.