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
Poisoned double agent Sergei Skripal asked Vladimir Putin to be pardoned and requested he be allowed to visit Russia, according to a friend.
A cloudy and wet start on Saturday across many central and southern areas of the UK.
The White House said troops with a diagnosis of "gender dysphoria presents considerable risk to military effectiveness and lethality".