Dogs may not yet be entitled to vote but they are allowed to come and watch as long as they don't disrupt the vote. Before the 2008 London Mayoral election polling staff were issued with advice stating that dogs had to be in an "accompanying" role rather than "free-range". In cases where a voter has two or more dogs and will struggle to control them while casting their ballot, polling station staff may be able to hold the dogs' leads. Rural constituencies might have cases of voters riding to the polling station. In such cases, horses and ponies should be tethered up outside. There is no guidance on other animals such as rabbits, ferrets or pot-bellied pigs, so any decision will be at the discretion of presiding officers.