Peanuts Begins by Charles Schulz for February 24, 2021

Shermie?

No matter how you dress it up, a dogfight is not funny.

Snoopy at a dogfight? How gauche!

Can’t see Snoopy in a dog fight unless it is against the Red Baron!

I think Schultz was referencing this song

https://youtu.be/pNGE1_PtrXQ

Obviously, this was before Charlie Brown had been established as Snoopy’s owner.

When did Charlie Brown become Snoopy’s owner?

Cockfighting is also illegal throughout the USA – a felony in 40 states and DC (per Wiki)