Previous versions can be seen here.
Since Beta 49.0, as long as you have a Dog in your hand, Greater Dog will have an additional 3 HP, which brings his HP up to 9. This allows it to survive quite a few strong monsters, like RG 01 and Undyne.
As mentioned before, you need Dogs to make its Aura work, and will be outclassed by Gyftrot and Coffee Man otherwise. Since Beta 49.0, Greater Dog is also the only Dog support card with Taunt, making a Dog deck quite vulnerable to an Aggro deck. You can counter this with the use of Snow Poff to summon more Greater Dogs and a fellow Dog Doggo to bring a hurt Greater back to your hand and replay it fully healed.
Silence is its biggest weakness, as not only will it lose its Taunt, it will also lose the +3 HP bonus (and any other buffs it could've gotten). Because of this, an Aggro Bravery deck is the most dangerous due to their access to Penetration, which silences all your monsters.
- Buffed Doggo (by Diamaincrah)