It is understood the incident occurred at approximately 11am on May 4 in Three Mile Water Park.
A police spokesperson said: “The man kicked this dog very hard in the stomach, sending him rolling into a bush.
“The man then ran from the Doagh Road towards Manse Road.
“The male is described as in his 40s, approximately 6ft, dark hair and beard and was wearing a long sleeved red top and black shorts.
“Any help would be appreciated to help us identify the assailant.”