As per the spell Awaken, your base Intelligence score has been set to 10. Additionally, when determining your ability scores, you increase one of those scores by 2 and increase a different score by 1, or you increase three different scores by 1. You follow this rule regardless of the method you use to determine the scores, such as rolling or point buy.

Dependent upon breed, you may live anywhere between 9 and 14 years, but no longer than 15 years.

Of course, those years are counted by humanoids, on their own scale of time. On your scale of time, each year is nearly 7 years worth of experiences and development that you have undergone.

Your alignment was significantly influenced by the caster who awakened you, but it can be any alignment.

Some awakened dogs seek a path towards being considered the goodest boy, opting to do bring fun and joy wherever they go. Others feel abandoned and betrayed by lesser beasts, or even the caster who awakened them, opting to take their leash in their own paws and performing evil deeds that fuel their own desires.

Before your awakening, you were an ordinary dog. Your size is small.

Because of your bestial physiology, you are faster than humanoids. You have a walking speed of 40 feet.

Your creature type is beast, rather than humanoid.

Unfortunately, you lack opposable thumbs. While most would consider this a great detriment, you have never seen an issue with it as you have always lived this way.

You are adept at holding objects in your mouth, though you can only hold one at a time. Adept enough that you can swing simple and martial weapons that lack the two-handed property, or even produce the verbal components for spells while holding an object.

You also lack the ability to climb surfaces, due to your physiology.

What you lack in thumbs, you make up for in acute senses. You have advantage on Wisdom (Perception) checks that rely on hearing or smell.

You can speak, read, and write one language, which the caster who awakened you chooses.