°An animal, member of the genus Canis (probably descended from the common wolf) that has been domesticated by man for thousands of years; occurs in many breeds. Scientific name: Canis lupus familiaris.
"The dog barked all night long."
°A male dog, as opposed to a bitch (a female dog.).
verb
°To go after with the intent to catch.
°To follow in an annoying way, to constantly be affected by.
"The woman cursed him so that trouble would dog his every step."