If you notice that your dog isn't entirely comfortable in the water, a life vest can help make your dog feel more secure. Older or sick dogs can't move around too well in the water, which is why a life vest makes sense. In addition, some dog breeds are less capable swimmers than others. These breeds include, for example, the Dachshund, which is not a very good swimmer due to its short legs. In deeper waters, when stand-up paddleboarding, or on a boat, you should also pack a life vest for your dog.