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Dog owners have been urged to take care after one dog died and another fell ill after eating chicken laced with rat poison while on their morning walk in Sydney's east.

Mila died after eating poison chicken breast. Credit:Christian Acuna

Christian Acuna​ was walking his twin beagle-cocker spaniel crosses in Queens Park last month when he noticed them eating something they had found under a bush.

"I saw both of my dogs eating what looked like a boiled chicken breast but because it was meat I didn't really pay too much attention to it," he said.