lackey; minion; sycophant; errand boy
Derogatory term for a subordinate who obsequiously follows orders, often used in political or organizational contexts. Carries a nuance of contempt.
He's nothing more than the boss's lackey.
He has completely become the president's lackey.
That politician is a minion of the powerful.
It's rude to call him a lackey of the opposition party.
He obeys his boss's every word like a lackey.
犬 as slang means a spy or informant working for someone in secret, while ポチ describes an openly obsequious lackey who just follows orders.
From the common Japanese dog name ポチ, used metaphorically to imply a person who follows orders like a pet dog.