Punting advice on laying a runner

Guys,
Just after some advice cos I'm not 100% sure how the system works when it comes to laying a runner in a race.
Can you lay any horse/dog in any race? How are the odds determined?
There is a story behind this;
On SAFM at the moment Hamish and Andy have a show and they've bought a greyhound called Fred Bassett. It ran at Sandown last Thursday Night I believe and because of the popularity of the show every man and his dog had money on it and it was a short priced favourite despite never having run before. It was in Box 1 and started OK but ended up running out of gas and coming last. As a popularity stunt they are taking the dog to Albion Park this thursday Night so the QLD fans get a look at it. No doubt every man and his dog will jump on it again and I'm thinking if it couldn't win at it's first race start from box 1 in Melbourne then it probably won't win whatever it's box draw is at it's 2nd race having to travel as well. I think laying this dog would be a good bet but I'm not sure how to go about placing the bet.
P.S. All the talk of laying animals is in no way any form of beastiality.
Cheers
Just after some advice cos I'm not 100% sure how the system works when it comes to laying a runner in a race.
Can you lay any horse/dog in any race? How are the odds determined?
There is a story behind this;
On SAFM at the moment Hamish and Andy have a show and they've bought a greyhound called Fred Bassett. It ran at Sandown last Thursday Night I believe and because of the popularity of the show every man and his dog had money on it and it was a short priced favourite despite never having run before. It was in Box 1 and started OK but ended up running out of gas and coming last. As a popularity stunt they are taking the dog to Albion Park this thursday Night so the QLD fans get a look at it. No doubt every man and his dog will jump on it again and I'm thinking if it couldn't win at it's first race start from box 1 in Melbourne then it probably won't win whatever it's box draw is at it's 2nd race having to travel as well. I think laying this dog would be a good bet but I'm not sure how to go about placing the bet.
P.S. All the talk of laying animals is in no way any form of beastiality.
Cheers