Ava, Ruger and Ginger, photographed by Seth Casteel for Underwater Puppies, the follow up to his best-seller Underwater Dogs. 

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A dog is not a poor-quality human companion substitute. A dog is a top-quality dog companion

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Photo: Leisa Rea

Why the internet loves cats – not dogs

Cats rule the internet, but why? Other animals are cute and funny too. BuzzFeed’s ‘beastmaster’ runs through the theories. Read more

Photograph: Amanda Edwards/WireImage

We asked you to share your photos of any pet however wet via GuardianWitness. From a wading water buffalo to damp dogs, here is a selection from the gallery

1. Photograph: Shirley Barrett/GuardianWitness

2. Photograph: Mariana Ramone/GuardianWitness

3. Photograph: markslaughter20/GuardianWitness

Dogs dressed as their owners - in pictures

Do dogs really look like their owners? They do in this project by Swiss photographer Sebastian Magnani – he has spliced together portraits of the owners with their four-legged friends in a series called Underdogs

See the full gallery here.

Photograph: Sebastian Magnani /Rex Features

Who’s a pretty boy then? A dog with animal designs at a creative grooming competition in Seacaucus, New Jersey. From picture desk live: the best news images of the day

Photograph: Ren Netherland/Barcroft Media

Family album of pampered pugs - in pictures Phillip Lauer and his wife Sue have, for the past six years, been transforming their dogs Blue, Bono and Roxy into fictional characters, rock stars and members of the royal family.

Photograph: Phillip Lauer / Barcroft Media/Phillip Lauer / Barcroft Media