"The big swan dives have become her regular method of pool entry, which makes us all laugh.
"The temperature has been soaring to over 40C most days this summer so the pool is a great way to cool off and get some exercise."
Ms Beresford said Stella was part of the embassy family of about 60 people.
"She's still a young dog and a bit naughty and has been known to wander into the ambassador's office to say hello, and regularly snores loudly through my meetings!
"Apart from the swimming, she loves to join in our weeklyembassy yoga class," Ms Beresford said.
"She does a good downward dog but hasn't the patience for the meditation at the end - she wanders between the mats licking faces."