The Oakland Raiders don't have a mascot. The pirate is just the symbol, but it's not the mascot and it does not have a name.
Red Raiders And there mascot is The Raider
raiders
raiders
A mascot is someone inspirational that is on the sideline or at court side in a event. He/she is basically cheering for it's hoe team.
According to this contributor's quick look around the internet, no major team has a pitbull as a mascot. Several sports team use a bulldog mascot, though.
They have a mascot because every team wants and likes to show school spirit.
The Ducks hockey team mascot is Wild Wing the Duck. He has been the teams mascot since 1993. The name for the Ducks mascot was chosen from a 'Name the Mascot' contest.
Sports teams from Oakton Community College are called the 'Raiders'.
Mr. Met is the mascot for the Mets!
The blue jays mascot is Ace.
A rooster is the mascot for France.