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.
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Martin Senn, a chief executive of the Swiss giant for six years, took his own life, according to his family.
The singer demanded a fan stop using a tripod during a live show and advised her to enjoy it "in real life".
Johnny Depp's band the Hollywood Vampires are due to play in Stockholm, Sweden, but face calls for the gig to be boycotted.