Mr J,

In Australia, there are virtually no limits on dogs BUT if you are betting dogs with IAS, Sportodds, Sportsbet you have to keep the bets low otherwise they will bet them back on the tote. I keep my bets with these three down to $150 Maximum. With the three totes (Unitab, NSWTAB and Tabcorp) the bets really have to be kept down in relation to the size of the pool. I never bet more than 150 on Unitab, $200 on the other two as their pools are much larger than Unitab.
I generally bet no more than $400 per dog so I spread it evenly over the six organizations.
Also, 8.7% of the BR per bet seems too high.
My longest run of outs is 17 and I have had other losing runs of 12 and 13. If I had bet this high on Friday, I would have lost over half my bankroll. My start bank each year is $50,000 and I draw $6000 per month for total living expenses.