The incident occurred in the village of Marton, north of Cooktown, about 150 metres from a boat ramp on the Endeavour River.
Steven Nicolau, who was fishing off the boat ramp at the time, saw the incident and explained: "It grabbed the dog by the hindquarters. The dog was trying to bite back, it was squealing.
"It wasn't a good sight but the other dog ran, came running past me and straight home.
"I went and saw the owner of [that] dog on my way home from the boat ramp and let him know.
"He said it's not the first time that his dog had witnessed a croc attack so yeah, it's a little bit lucky his dog."
World's deadliest animals
Man feared killed by crocodile after swimming in river
Although they might look cumbersome and cute, hippos are actually one of the most feared animals in Africa, and can outrun a human. When a male feels its territory is threatened, or a female thinks her offspring her in danger, these animals can be particularly dangerous. And with huge teeth and mouth that can open four feet wide, it's a good idea to steer clear. Kills: An estimated 100-150 people a year. Deadly technique: Hippos will charge, trample and gore its victims, and have been known to upturn boats and canoes without warning. Lives in: Africa
Many people might not realise that the cape buffalo is one of the most dangerous animals in Africa, and will react with force when it feels threatened. These beasts can weigh up to 1.5 tons and stand at 1.7 metres high; they're so intimidating that even lions don't usually consider them dinner. Cape buffalos will charge, and then gore its victim to death with its impressive horns. Kills: An estimated 200 people a year. Deadly technique: These animals will charge and gore their victims to death with their huge horns. Lives in: Africa
Out of the world's 2,000 species of snake, around 250 are thought to be capable of killing a man. The Asian cobra does not have the deadliest venom, but is believed to be responsible for the biggest portion of the thousands of snakebite deaths every year. In Africa, the black mamba is the largest venomous snake and, during an attack, can strike up to 12 times, each time delivering enough neuro and cardio-toxic venom to kill a dozen men within 1 hour. Kills: An estimated 50-125,000 people a year. Deadly technique: A snake will use its fangs to pierce the skin and inject its paralysing venom. Lives in: Africa, Asia, Australia, North America
Box jellyfish can have up to 60 tentacles as long as 15 feet. And each tentacle contains enough venom to kill 50 humans, making it one of the most venomous marine creatures in the world. If stung, a box jellyfish can kill a man within minutes. Kills: An estimated 100 people a year. Deadly technique: Jellyfish use their tentacles to pump venom and paralyse its prey. Deaths in humans are usually a result of cardiac arrest. Lives in: Northern Australia, Papua New Guinea, Malaysia, Indonesia, the Philippines, Thailand and Vietnam.
Apart from humans, the mosquito is the deadliest creature on the planet. It kills millions of people every year through the spread of diseases like malaria, yellow fever, and dengue fever. Many of the malaria victims are children under the age of five. Kills: Two to three million people a year. Deadly technique: Female mosquitos pierce the skin with serrated mouth parts, and inject a saliva with a thinning agent to liquidise the blood. Lives in: Worldwide, more harmful in Africa, Asia and North America
The great white shark, which can grow up to six metres in length and weigh up to five tons, seems to have the most ferocious reputation. But, while they have been known to attack humans, most of these incidents are thought to be 'test bites', where the animal is deciphering whether he wants to eat you. And, generally, they humans are not on the menu. It is thought the aggressive bull shark is responsible for the most attacks on people. Out of the 360 shark species, only four are known killers: the great white, the bull, tiger, and the oceanic white tip. Kills: An estimated 100 people a year. Deadly technique: Sharks use their razor-sharp teeth to rip chunks out of its victims. Great whites usually take a big single bite, drag their victims into deeper waters, and wait until the prey bleeds to death before they eat it. Lives in: Florida, Australia, Hawaii and South Africa.
The are lots of different species of bear, but the polar, black and grizzly are the deadliest. Native to the Arctic, polar bears could decapitate a human being with one swipe of their massive paws. Bears generally attack when they are hungry, so it's a good idea to keep food away from your camp. Kills: An estimated 5 to 10 people a year. Deadly technique: Bear will use their teeth and claws to maul and trample their victims. Lives in: North America, Canada, North Pole, and Russia.
Crocodiles have been around for 200 million years, and are fearsome predators. The saltwater crocodile, or saltie, is the largest living reptile in the world, and can grow up to 21ft long and weigh 1.6 tons. These animals can run extremely fast on land, and, in the water, can swim as fast as dolphin. Many fatalities occur when people are washing or gathering food near river banks. Kills: An estimated 600-800 people a year. Deadly technique: Crocodiles will grab their victims with terrifying speed, and often launch into a 'death roll', weakening its prey, dragging it under water and drowning the victim. Lives in: Africa and Australia
Out of the 1,500 species of scorpion, the African spitting scorpion is thought to be the most deadly, and can spray its venom up to a metre. Arounf 25 species of scorpion are thought to be deadly to humans. Kills: An estimated 800-2,000 people a year. Deadly technique: Scorpions use their tail stingers to paralyse their prey with venom. Lives in: Worldwide; particularly Africa, the Americas and Central Asia.
Weighing in at up to eight tons, although beautiful creatures, elephants can be lethal. African elephants in particular can be aggressive, especially older bulls and young males. These creatures, unsurprisingly, are more aggressive in areas where poaching is rife or when their habitat is threatened. Kills: An estimated 300-500 people a year. Deadly technique: Most human deaths are result of the elephant trampling on its victim. Lives in: Africa and India
African lions are the biggest of the big cats, and are known to kill around 70 people in Tanzania alone every year. With the destruction of their habitat, human attacks by leopards in India, and the North American mountain lion are thought to be on the increase. Kills: An estimated 800 people a year. Deadly technique: African lions will often use strangulation to kill their prey, while tigers will attack from the back and aim for the jugular, and mountain lions will maul their victims. Lives in: Africa, North America, and India
Man feared killed by crocodile after swimming in river
You don't have to go to exotic shores to find dangers lurking in deceptively calm waters. Morecambe Bay, in Lancashire, is notorious for its quicksand and fast moving tides, which took the lives of 23 Chinese cockle pickers in 2004. Visitors should only cross the sands of Morecambe Bay with an official guide.
Poor old Bikini Atoll was once just a beautiful group of islands in the South Pacific. Then, in the Forties, it became notorious for two things: providing the name for the saucy new two-piece swimsuit, and being chosen by the US as the site for nuclear testing. The amounts of radiation that still exist in the food chain have made it impossible for the Bikini Islanders to return to their homeland, although tourism has been introduced to the ship graveyard dive site in Bikini Lagoon.
An unofficial wooden beach sign at Hanakapiai on Kauai island shows more than eighty tally marks representing those who've drowned there, official reports put the number at thirty. Either way, the rip currents here are so treacherous, the sign's warning not to go in, or even anywhere near, the water is worth taking very seriously indeed.
Other beaches might have more frequent shark bite attacks, but nowhere are the sharks more aggressive and the attacks more likely to be deadly than in Port St Johns, on South Africa's southeastern coast, which has seen six fatal shark attacks in just over five years. Locals believe the bull sharks here are particularly blood-thirsty because witch-doctors make animal sacrifices on the beach, throwing the entrails into the sea.
Just when you thought Chowpatty Beach couldn't get any dirtier, a cargo ship sank off the coast in 2011, its load of 60,000 metric tons of coal polluting the water even more. Despite the layer of rubbish on the sand, locals still use the beach for their evening promenade, and even venture into the water every September during the festival of Ganesh.
Ok, as far as we know no one's ever actually been hit by an airplane while innocently sunbathing on St Martin's Maho Beach, but you only need to take a look on Youtube to see how dangerous getting up close to the jets can be as they take off from the scarily close airport. Blown away, literally.
A relaxed attitude to nudity and soft drugs may attract many travelers to the stunning hippy haven of Zipolite, but it's name - The Beach of the Dead - and the fact that there is a cliff at the far end of the beach covered in crosses to mark those who've died at the mercy of the powerful rip tides - reveals a rather scarier side of paradise.
Volusia County, Florida holds the dubious honor of being the world's shark bite capital, with 231 reported attacks from when records began in 1956 and 2008. And if the sharks don't get you, a bolt from the sky just might, as Central Florida has more lightning strikes than anywhere else in the world.
It's a cruel trick of nature that water as beautiful and clear as that surrounding Australia's Fraser Island conceals sharks, jellyfish and rip tides so dangerous you can't swim in it. Dry land's got its fair share of potentially fatal fauna too, including dingos, Funnel web spiders and pythons.
The waters off Recife are so shark-infested that even the lifeguards don't go in the sea any more, training in a nice, safe swimming pool instead. After 56 shark attacks in the last twenty years - 21 of them fatal - surfing's been banned, and if that's not enough to put you off, the fact that most of Recife's sewage runs untreated into the water, just might.
Kilauea is one of the most active volcanoes in the world. Lava flows onto the beach and into the sea, making the water temperature a whopping 110C.