A postman who runs dog obedience classes is spearheading a campaign to prevent Royal Mail workers from being attacked.
Royal Mail are protecting their workers
Flint postal worker John Doley, who has been bitten once himself, is urging local dog owners to keep their animals inside when mail is being delivered.
"Some people think it's a joke but you can get quite seriously hurt.....a small dog can do just as much harm as a big dog can," he said.
"When I was bitten I had to go to hospital but it's not as serious as some people.
"Dogs can do permanent damage....people have had their fingers bitten off as well."
Mr Doley's warning follows a spate of attacks by dogs across the region.
In north Wales, 98 postmen and women were attacked as they went about their rounds between April 2002 and March 2003.
Across Wales, there were 5,868 dog attacks, resulting in 5,770 days lost in sick leave.
Although the majority of attacks are by dogs, there have been incidents reported involving cats, pheasants and geese.
Royal Mail's area manager for north Wales, Ian Johnstone said dog owners need to help the delivery service.
"The majority of dog owners are very responsible when it comes to keeping our delivery staff safe," he said.
"But dog bites are still a major cause of injury to our postmen and women and the effects can cause considerable distress to those concerned.
"We therefore appreciate it when dog owners take extra care to keep their pets under control when we arrive with their post."
Following an attack or near miss, householders receive a letter from Royal Mail asking them to keep their pets under control or risk losing their doorstep delivery.
In more serious cases the local dog warden and police are informed.