He commanded his 100-pound American bulldog Rocky to attack the three-term delegate, police said. The dog bit Dwyer. Then Lucabaugh threw Dwyer into the water, according to the report.
Dwyer could not be reached for comment. No one answered the door at Dwyer's home on Tuesday afternoon.
Dwyer was charged early Tuesday morning with driving under the influence of alcohol. That charge comes two weeks after Dwyer pleaded guilty in a drunken boating incident that injured seven people last August.
The police report does not say what prompted the assault. But Dwyer told officers that Lucabaugh became enraged when Dwyer refused a cigarette from Lucabaugh.
Lucabaugh was trying to get Dwyer to smoke a PCP-dipped cigarette without his knowledge, police said.