Don't tease yourself so much, try to be yourself and bid farewell to single dog.
Extended information: According to fossil research, the earliest animals on earth originated from the ocean. After a long geological period, the early marine animals gradually evolved into various branches, enriching the early life forms of the earth. Prehistoric animals appeared before the appearance of human beings, and prospered in their respective activities. Later, they became extinct in the ever-changing living environment. However, the animals on the earth are still evolving and multiplying from low to high and from simple to complex, and have today's diversity. Scientists divide the existing animals known to human beings into invertebrates and vertebrates according to whether they have spines in their bodies.