Satty is a dog from The Legend of Zelda: Breath of the Wild. He is a Hylian Retriever owned by the Hylian hunter Quince whom he befriended while hunting on Satori Mountain. Link can encounter them at the Wetland Stable.
Satty befriended Quince while he was hunting on Satori Mountain. Quince noted he was a dirty little pup whom Quince figured had been separated from his parents or abandoned on the mountain by his last owner. He begged for food and Quince gave him some jerky and he ran off over a hill. He later rescued the hunter from an encounter with a glowing beast that startled Quince after he had dozed off and couldn't draw his bow. Unbeknownst to Quince the beast was actually the guardian spirit and reincarnation of a sage who once lived there that protects the mountain's animals. As the spirit was about to seemingly trample the hunter, Satty bravely defended Quince and the spirit ceased its attack on Quince allowing Quince to grab Satty and flee down the mountain, tripping and falling all the way.
It is unclear if the spirit was truly startled by Satty or ceased its attack once it recognized Satty's desire to protect the hunter whom had been kind to him. As animals and some spirits are known to be able to communicate with one another, Satty may have convinced the spirit to spare Quince whom was just hunting to make a living, something which Quince was unaware of due to being unable to understand them. It should be noted the spirit does not harm Link if he hunts on Satori Mountain, indicating that Quince, and possibly Satty, may have misinterpreted its intentions and it may have meant Quince no harm and may have shown itself to Quince for his kindness towards Satty.
As a result of this encounter the two became inseparable traveling companions. At one point, Prince Sidon came to the Wetland Stable and asked Quince, an archer and hunter by trade, for his help with a problem in Zora's Domain that required Hylian assistance but Quince didn't want to abandon Satty or put him danger and was forced to refuse. If Link asks Quince about Satty, he will tell him the long story of his meeting and rescue by Satty. After finishing the tale he will tell Link to visit Satori Mountain and give the glowing beast a stern talking to if he's feeling brave. Satty behaves like most dogs of his breed Link encounters, as he enjoys food though will bark aggressively if attacked. If Satty is feed three pieces of food he will lead Link to a buried chest containing an Opal. Due to his bond with Satty and encounter on Satori Mountain, Quince puts Satty's well-being before his own and often worries about him to the point of having dreams of Satty being in danger.