Why do border dogs have single blood circulation and double blood circulation?

Not only do border herders have single and double lineages, but many dogs also have them. Like Teddy, Labrador, almost all dogs. The so-called bloodless is the summer in Princess Pearl. A poor man.

The so-called single lineage is Xia's daughter. Half of the royal blood.

The so-called double bloodline is Yongqi. Pure royal blood.

And the so-called online, some bad sellers with blood certificates and flags. The dog for sale is the familiar Sister Rong. On the surface, he is in the palace. In fact, he is just a handyman. The most important thing is that it is not as good as summer. Piano, chess, painting and calligraphy know nothing. It seems that people in the palace can only poke Wei Zi with a needle. Why? Because Wei Zi is at least of single blood, but Sister Rong feels insulted. Why can Wei Zi enter the palace as soon as she enters it, but she can't stay in it for so long?

So is Teddy. Don't think that in the palace, you are double blood or single blood. Don't think that you have the so-called blood syndrome, you are the fifth brother. You can be mother Rong.