all the meanings it has the word Dog?

Answer 1

The Denotation of dog is four-legged canine carnivore. Alternatively, the connotation of the word may be thought of as the set of all its possible referents (as opposed to merely the actual ones). So saying "You are a dog" would imply that you were ugly or aggressive rather than stating that you were canine.

Any four-legged, pack hunting, carnivorous animal of the genus Canis.
Man's best friend.
What males often refer to close friends as.
A person that takes off and leaves you, be they male or female.
A man unable to commit
One ugly girl or man.
Acronym for Dirty Old Guy

Answer 2

Dog day afternoon
Three dog night
Ain't nothin' but a hound dog

Answer 3

I knew a dyslexic agnostic insomniac that couldn't get to sleep because he wondered if there really was a dog.

Answer 4

i think it means lesser u know...dogs walk on all fours lower than us...will eat anything i guess its an insult if someone calls u a dog....idk that's my opinion