Definitions for "Fixed Odds"
All bets sold by Sportsbet are fixed odds bets. This means the return of the bet is fixed at the moment of purchase (subject to betting rules e.g. a Dead Heat). If your bet wins your Client Account will be automatically credited with the return shown on your Ticket receipt.
Your divined is fixed at the time you receive your ticket and does not fluctuate no matter what happens after this point.
When investing with the totalisator, the public essentially bet against each other, not against fixed odds, therefore dividends can fluctuate dependent upon investment.