Thanks for the the replies everyone. Much appreciated. Just a few observations:

Crash
- I was after an idea of how many favourites placed, not won, at the dogs.
- You don't have to bet on every race. Let them go if you are not ready. Especially with the dogs there will be another along very shortly!!
- becareful is correct in that you never get Diviplus for the place on the dogs (not even the horses come to think of it). It is the NSWTab plus the odd cent or two.
- Testarosa's plan is a parlay approach --- and, of course, this is its strength.

Just a simple example:
A mixture of three horse races and one dog race on Saturday last gave (for a place) dividends of $2.30, $1.10 (yes, Lonrho), $1.50, and $1.50.
Starting with four bets of $10 and parlaying them according to the system, the outcomes were $34, $37.80; $52.80, and $31.50 -- a total of $156.10 (including the original $40.00). For me not a bad return anyway. A lot of fun --- and the worse possible result being a loss of $30.00 (because the fourth $10 would not have come into play if you missed on the first bet).

becareful
- it gets very frustrating when something showing $1.80, $2.00 or similar for the place end up a few seconds later as $1.04 at the start. Tell me about it!! But it does work the other way too. Something showing only $1.10 or money back a few moments before the start can pay $1.50, $1.80, etc at the start.
I guess it is because the punter at the pub or TAB rushes in to double his money when a sure thing is showing $1.90 or the like a minute or so before the start (and so shortens). Whereas if $1.10 showing it is of no interest (and insisting on having a bet) the 'mug' punter puts the money on another dog and so the favourite blows out a bit at the last moment. Trust this tortuous reasoning makes sense to all :???: