Vigilance

Obtaining
Vigilance is a canine companion that can be found most of his days at the Markarth Stables. Once there, you will see a guy named Banning. Talk to him, and you will have the option to buy the dog for 500 gold. You can also ask a few questions about Vigilance.

Note: Once you get Vigilance, if you ask it to go back home, you'll have to pay another 500 gold to get it back to follow you.

History
When talking to Banning, he mentions that he and his family have been training dogs for the Jarl (and for his own use). He also refers to the dog as a War-Dog, and rightfully so. He is from a litter of dogs that were bred for fighting and protecting, which is probably he is known as a vigilant war-dog.

Combat
This dog is fast and agile, meaning he can track down enemies rather easily. (more info needed)

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