LA MESA — Oreo is proving to be one tough cookie.

The 8-year-old terrier-beagle mix has been at the Pet Emergency & Specialty Center in La Mesa since Friday after being poisoned with a strychnine-laced ball of meat.

The dog, who belongs to La Mesa residents Irwin and Jeannene Smith, has been on a ventilator since Saturday morning, but is expected to be breathing on his own Monday. His prognosis for survival is good.

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