Other contributors have said "It's a dog-eat-dog world?" is the same question as "What does the phrase 'dog-eat-dog' mean as in 'It's a dog eat dog world'?" If you believe that these are not asking the same thing and should be answered differently, click here
What does the phrase 'dog-eat-dog' mean as in 'It's a dog eat dog world'?
As in, "It's a dog eat dog world?" The saying is refering to the life of dogs and how they would kill each other just to be the higher rank or the winner, champion, to get the female. In other words...
Yes, dogs can eat hot dogs - my parent's two large breed dogs love them, so my parents use hot dogs to hide pills in. Hot dogs are made from beef, pork, chicken and turkey, so it's just another meat...