Dog-eat-dog and Dog eat dog

Dog eat dog and dog-eat-dog are semantically related In some cases you can use "Dog eat dog" instead an adjective phrase "Dog-eat-dog".

Dog-eat-dog and dog eat dog are semantically related in mean topic. Sometimes you can use "Dog-eat-dog" instead an adjective phrase "Dog eat dog", if it concerns topics such as ruthless, willing to oppose, without mercy or care.