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Hi, Madeline here. We're on our summer break here at Science Weekly. We'll be

back with some new episodes for you next week. But for now we're going back to

some of our favorites from the year so far.

This episode is all about the fascinating parallels between humans and our pet dogs

when it comes to the fight against obesity.

Labradors are known for being greedy guts, but scientists have now pinpointed

some of the genetic factors that help to explain their behavior.

I travel to Cambridge with science correspondent Nicola Davis

to find out more. Enjoy.

When it comes to food, Labradors and Retrievas have got themselves a bit of a reputation.

Leo is a very big chunky black Labrador. Anything there is there to eat he will eat it.

Catherine's dog Leo stops at nothing for a nice bit of grub.

We were having a barbecue at our house once and everybody had brought some food and we put the desserts under the table and so all of a sudden someone saw Leo under the table and he'd eaten half a bowl of trifle.

Leo just can't resist and he's not alone.

The Royal Veterinary College has described obesity in dogs as a modern day epidemic.

We've trained him that he shouldn't pick vegetables out of the vegetable garden, so now

he won't do it if we're there. He just does it if he thinks we're not looking.

When she was trying to get to the bottom of Leo's insatiability,

Catherine came across a study.

I saw an advert for people who had Labradors wanting to take part in this research

...