1. noun /dɒɡ,dɔɡ,dɑɡ/
a) An animal, member of the genus Canis (probably descended from the common wolf) that has been domesticated for thousands of years; occurs in many breeds. Scientific name: Canis lupus familiaris.
The dog barked all night long.
She’s a real dog.
Syn: Canis familiaris, Canis domesticus, Canis canis, domestic dog, hound, canine, bloke, chap, dude, fellow, guy, man, cad, bounder, blackguard, fool, heel, scoundrel, click, detent, pawl, andiron, firedog, dogiron
2. verb /dɒɡ,dɔɡ,dɑɡ/
a) To pursue with the intent to catch.
The woman cursed him so that trouble would dog his every step.
b) To follow in an annoying way, to constantly be affected by.
It is very important to dog down these hatches...
Wikipedia foundation.