Specific analysis:

1. The difference between dog food. Doberman is more particular about eating, Su Mu is better, but Keka is less particular about eating. So eat: Doberman > Su Mu > Cocoa.

2. Bathing: The bigger you are, the more expensive you are. Dobbin > Su Mu > Cocoa.

3. Exercise: Dobbin = Su Mu > > Coke.

4. For strangers and dogs: Dobbin is cold and not enthusiastic about strangers, but it also depends on the specific owner and environment. I mean in general; Su Mu is good with everyone, especially children; Cocoa is very similar to Su Mu, but small dogs are relatively less stable than large dogs. So, friendliness: Su Mu > Cocoa > Dobbin.

5. Barking: Dobbin > Cocoa > Su Mu.

6. Vaccine: All the same.

7. registered permanent residence and other formalities: Dobbin = Su Mu > > Keka.

choose according to your own time and economic conditions.