As a former member of the dog unit myself, I know the strong bond between a police officer and his dog.
Whilst they are working dogs, they also become a close and important member of the police officer's family. This is a very sad occasion.
More top news
Mr Gard and Miss Yates want to spend the final hours with their son at home in Bedfont, west London.
A ninth penguin was injured.
The animal killer is thought to have killed more than 250 creatures and has now been linked to the mutilation of a deer in south Croydon.