Nearly two thirds of children have admitted being scared of family pets, according to a new report by veterinary charity PDSA.
The charity also found that more than one million dogs in the UK are displaying “problem behaviour”.
This is because owners who fail to socialise and obedience-train dogs at an early stage are fuelling "frightening" levels of problem behaviour in their pets, the charity have said.
In some cases dogs have been deliberately trained to be aggressive but the primary cause of anti-social behaviour in dogs was a lack of socialisation and basic obedience training when dogs are young, the report said.
A majority of dogs, at 61%, had not attended training classes within their first six months of life, according to the findings.
The research forms part of the second PDSA animal wellbeing report which claims obesity, aggression and illness are set to take over the pet population if they are not tackled.
An estimated 18.5 million dogs, cats and rabbits are being fed unsuitable diets and treats in spite of their owners knowing about the health risks, the report said.
The charity warned that an estimated 11.2 million pets are not vaccinated or neutered leaving them at "serious" risk of developing potentially fatal illnesses.
Children should be taught at school how to be good owners in the face of research showing "fundamental" gaps in knowledge about animal welfare, the PDSA said.
The charity said 1.3 million dogs across the UK were displaying "problem behaviour" with nearly one in three, or 30%, of dog owners reporting being bitten or attacked by a dog.
while a separate survey of children found nearly two thirds, or 65%, reported having been frightened or scared by a dog's behaviour.
- 1.3 million dogs across the UK are displaying "problem behaviour" the PDSA have said.
- Nearly one in three, or 30%, of dog owners reporting being bitten or attacked by a dog.
- More than half of dog owners, or 51%, said they knew someone who had been bitten or attacked by a dog.