Elaine Pendlebury, PDSA senior veterinary surgeon, said pet obesity causes "daily misery for millions of pets."
She added, "vet practices across the UK see the consequences of pet obesity every single day such as obese dogs unable to enjoy regular walks due to exhaustion, fat cats that can't jump or play, and rabbits so hopelessly overweight they can't clean themselves properly."
More top news
The 74-year-old Prisoner Cell Block H actress will face court next month charged with the indecent assault of a 13-year-girl in the 1980s.
The PM will promise today to unmask the corrupt offshore companies that are buying up luxury London properties using "plundered cash".
A public inquiry into undercover policing in England and Wales is to be formally opened today.