Due to the magic flowing through them, Awakened Canines live longer than their non awakened counterparts, but have short lifespans nonetheless.
An awakened Canine reaches adulthood at around 2 years old, and can live to 50 years.

Because of their nature, Awakened Canines tend towards Good Alignments. They can, however, be heavily influenced by their master (if they had one).

Awakened Canines are the same size of their non-awakened counterparts. 
You can pick between Medium or Small.

Medium Canines have 35ft walking speed, and a + 1 to their Str score as per ability increase trait.

Small Canines have 30ft walking speed, and a + 1 to their Dex score as per ability increase trait. They also gain the following feat:

Nimbleness
You can move through the space of any creature that is of a size larger than yours.

Your Charisma score increases by 2.
If you are Medium Sized your Strength score increases by 1.
If you are Small Sized your Dexterity score increases by 1.

Awakened Dogs are swifter than most bipedal races. Your base walking speed is 35 feet.

You have exceptional senses of hearing and smell. You gain advantage on any Wisdom (Perception) checks that rely on hearing or smell.

You are proficient in your choice of two of the following skills:
Animal Handling, Persuasion, Intimidation, Perception.

The Awakened Canine has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 ft. of the creature and the ally isn't incapacitated.

Because of your fierce bite, your teeth are natural weapons, which you can use to make unarmed strikes. If you hit, you deal slashing damage equal to 1d4 + Strength modifier,  instead of the bludgeoning damage normal for an unarmed strike.

If the target is a creature, you may attempt to grapple it, once per round. The target must succeed a DC (8+ your proficiency bonus + your strength modifier) Strength saving throw or be Grappled. 
This is the only way an Awakened Canine can grapple.

With the lack of opposing thumbs comes many disadvantages. An Awakened Canine cannot do any actions that requires hands, even less so two hands. They are limited to holding things in their mouth.

Your Canine cannot attempt Dexterity (Sleight of Hand) checks, if they involve the use of hands.
Any climb that requires hands and feet is especially difficult for you, so each foot of movement costs you 5 feet instead of the normal 1.

Canines can wield on their mouths, weapons that have the Light attribute. They can also use their paws for the somatic components of spells, but material components should either be on the ground in reach of their paws, be placed there by the Canine or held in their mouth. 

For an unarmed strike, your Canine can bash the target or attack with their paws.

Awakened Canine are able to speak and read one language of your choice, which must be a language known by the caster of the Awaken spell.
They can also write, but no amount of training can make this writing entirely legible.

To communicate with other dogs, they can bark.