If I love dog, I will buy Dogecoin, not SHIBA or many other dog tokens.

Dogecoin is King in those dog coins and tokens. If Dogecoin rises, the others will follow it. If Dogecoin falls, the others will fall.

You need to think why do you want to buy SHIBA? Because you think it will rise with Dogecoin. So if it is what you think, Dogecoin is obviously a better choice.