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British Bulldogs are a very stocky breed of dog. They have lots of loose folds of skin around their shoulders. They have a wide head, also with lots of skin folds, a short muzzle and an underbite.
Bulldogs have been bred to be friendly and docile and despite their reputation and scary looks, they make good family pets.
Cogs are the small "teeth" around the edges of gears. Cogs allow the gears to grip onto each other as they turn around.
Scientific name: canis lupus familiaris
People have been keeping dogs as pets for thousands of years. Dogs can be used to herd animals like sheep, and if they are well trained they will obey commands like sit and fetch.
Dogs come in a huge variety of different colours and sizes, from tiny Chihuahuas right up to huge dogs like the Great Dane. A female dog is called a bitch and a baby dog is called a puppy. Modern dogs were domesticated from wolves, and were originally kept as hunting companions.
Frogs can be found around fresh water, including in deserts when it only rains every few years. They can breathe through their skin when they are in water. Frogs lay eggs, which hatch into tadpoles. Frogs come in a great variety of colours and can range in size from as small as a fingernail up to about 30cm long. Frogs that are very warty are often called toads.
Grog is a slang term for alcoholic drinks, particularly strong ones.