Milk distribution costs have risen steeply since April, when 43, 000 delivery staff won a pay increase of 15%.
Bob Neal, of Royal Mail, said the safety advice was not to send delivery staff out in the extreme weather.
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Royal Mail praised its delivery staff for the improved service at the beginning of this year, saying radical business changes it had made had improved its performance, and predicting more improvements.
Unions representing postal, utility and delivery staff have long argued for laws to be extended to cover attacks in dog owners' homes, saying this is a "major loophole" in the law and their workers - as well as others - need more protection.
Daily I have to deliver part of another round before I even start to do my own delivery because of staff shortages.
He now employs three chefs for pizza-making duties and along with waiters and delivery boys he has a staff of 10.
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Delivery companies like UPS and FedEx also often increase staff in November and December.
Royal Mail spokesman, Adrian Booth, said the company was "extremely disappointed" that staff at Bristol's Mead Street delivery office had voted in favour of industrial action.
Thousands of items of mail were left undelivered, which Royal Mail said was due to staff sickness, but the CWU said delivery rounds were too large for workers.
Those suits charge that a botched delivery or poor diagnosis by doctors and mistakes by hospital staff are to blame for the result.
It also made the continued delivery of high-quality funeral services difficult for both the staff and the other professionals involved, it said.
Thousands of items of mail were left undelivered, which Royal Mail said was due to staff sickness, but the CWU said was because delivery rounds were too large for workers.
The CWU said delivery rounds had been revised, forcing too much work on the staff.
The company had a staff of 1, 500--most of them delivery people using bikes, scooters, cars and vans to get that copy of The Breakfast Club across town.
Workers at all 21 delivery depots across Liverpool walked out, with CWU branch representative Mark Walsh saying staff felt they were being "being bullied into having their contract changed".
The post includes being the professional head of the staff at the city council, and will be responsible for the delivery of Mayor George Ferguson and the council's vision.
The government will also outsource the recruiting, training and payments to census staff as well as creating a central address register "to facilitate improved form delivery and field management".
These could see the worst performing 10% of staff face being fired after a year if they fail to improve, new delivery methods for services, and ministers given the power to choose who runs departments.
Floodwaters rising, the staff, increasingly cut off from the outside world, fled the building famously in the back of newspaper delivery trucks.
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