Gunner's Big Day on Frobisher Bay

"As we anchored in the cove where the glacier touched the sea, I had this funny feeling that I had to have a pee "

Gunner the dog can't wait to go fishing with his family. But on their way, he starts to feel a familiar urge. He has to go pee Gunner's mom rushes him to shore, but as they get closer, they encounter a scary surprise. Can Gunner make it to land before it's too late?