Molly, a two-year-old Jack Russell, was out for a morning stroll at Ramsgate's Government Acre with her owner, Joan Pressley, 64, on Thursday when she slipped through some railings and dropped into a bush just below the cliff's edge.
Joan said: "I went to look over the railing because I could hear noise from the protest below – I thought I could hear the animals in the trucks crying.
"Before I knew it, Molly was through and jumped down into a bush and could not get up."
"I didn't expect the policeman to go over the railing. I probably would have tried to stop him if I had been with him at the top."
Joan is also thankful to the demonstrators who came to Molly's aid.
She said: "Two of the demonstrators pulled open one of their big banners to catch Molly in case she fell. They were very kind."