If you mean how to change a name before a race has started then ask your bookmaker. They may be willing for you to change the name on a greyhound ticket if nothing substantial has happened that either guarantees a greyhound will win or lose.
If you are wanting to change it during a race then this will not be allowed by the managers or bookmakers - it would be cheating themselves out of money. If you got caught they may well suspend or even ban you from the track. So this is generally not advised as it could land you in quite a bit of trouble.
A greyhound ticket is something you receive when you have placed some money as a bet on which greyhound will win the race. The ticket will have the name of the dog you put the bet on so that you cannot claim to have bet on a different dog if your chosen dog does not win. This is why it is not advised to change the name on the ticket because the names are put on there for a reason, and that reason is so that there is no confusion about your bet. If you start trying to alter the tickets then most betting offices will spot the fraud and you may be banned.
If you are wanting to change it during a race then this will not be allowed by the managers or bookmakers - it would be cheating themselves out of money. If you got caught they may well suspend or even ban you from the track. So this is generally not advised as it could land you in quite a bit of trouble.
A greyhound ticket is something you receive when you have placed some money as a bet on which greyhound will win the race. The ticket will have the name of the dog you put the bet on so that you cannot claim to have bet on a different dog if your chosen dog does not win. This is why it is not advised to change the name on the ticket because the names are put on there for a reason, and that reason is so that there is no confusion about your bet. If you start trying to alter the tickets then most betting offices will spot the fraud and you may be banned.