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Cellphone video of the incident was posted to Facebook on April 6.

In the graphic video, the man is holding the dog by the neck, dangling it over the porch.

Animal Services and OPD said they went to the neighborhood on Monday, but residents would not identify the man.

The dog's condition has not been released.

Anyone with information on the incident is asked to contact Crimeline, which can be done anonymously, by calling 1-800-423-TIPS (8477).