Lulu and the dog from the sea

Lulu and her cousin go with Lulu's parents rent a house for a vacation by the sea and encounter the Dog from the Sea. It's a homeless dog who scavenges for food and water and who has alienated himself from all the residents by digging in their trash. Lulu and her cousin lose their hearts to this dog. You know what's going to happen and you are glad it does. And it is all good.