Wait, Shiba Inu and Dogecoin aren't the same thing?
Shiba Inu (SHIB) was created in mid-2020 as a lookalike cash grab on the then-surging Dogecoin. It was shilled heavily on Twitter and across social media. Ads attempted to confuse would-be investors looking to buy Dogecoin. For some reason or another it maintains a modest market cap.
The success of Shib spawned countless more lookalikes, eg. Baby Shiba Inu, etc.
Dogecoin is the original.