Brutus the Cat

This is Brutus the ferocious orange Cat in 

"Race for your life, Charlie Brown" and "Somebody you'll find her, Charlie Brown" 

and he was Snoopy's Enemy. 

That Brutus has a Spiky Collar around his Neck to make him vicious. 

But Brutus was not a Dog, 

he was a Cat. 

Those Spiky Collars are for ferocious Animals.