You have advantage on Perception based checks based on hearing and smell and disadvantage on Perception based checks that rely on colour recognition.
When an ally within 5ft is hit with an attack you may use your reaction to make an attack against the attacker.
You can use the network of local dogs to find information about a town or city you are in, such as where to get food and shelter.
By sniffing certain locations in towns and cities you can learn information about the location, such as the quality of food and water, population levels, general mood and atmosphere.