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
A manhunt is underway after gunmen dressed in women's clothes and SWAT team uniforms attacked a boxing event in Dublin, leaving a man dead.
Thousands of junior doctors and their supporters, wearing surgical masks, will hold a demonstration over pay and conditions.
The eight-month-old female pup, which was severely underweight and dehydrated, was asleep in a dining booth.