Meaning
Hard-hearted, cruel, and without pity — used of a person so cold and merciless that they can do wicked, heartless things and feel nothing. A 'dog-heart' person has no compassion, capable of abandoning, betraying, or harming others without remorse. The image sets the supposed heartlessness of a stray dog against human feeling, and the word is one of the strongest condemnations in Jamaican speech, reserved for genuine cruelty and a stone-cold lack of mercy.
Examples
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Only a dog-heart man could treat him own madda suh.
Only a heartless man could treat his own mother that way.
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Dem dog heart fi lef di people dem suffer.
They're merciless to leave the people to suffer.
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Nuh badda beg him — him dog heart, him nah listen.
Don't bother begging him — he's cold-hearted, he won't listen.
Origin
Figuratively a heart like a dog's — here connoting coldness and savagery without human pity; 'dog-heart' brands someone cruel and unfeeling.
How it’s used
A strong condemnation of cruelty and lack of compassion.