Owners who fail to socialise and obedience-train dogs at an early stage are fuelling "frightening" levels of problem behaviour in their pets, according to the report.
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.
More top news
The man who drove the van that ploughed into pedestrians killing 13 people was unharmed and is still on the run, police believe.
Donald Trump has said American culture is being "ripped apart" by efforts to remove Confederate memorials from parts of the country.
It's a bright start for many this morning, with a mixture of sunshine and showers across the UK.