Hound master

Houndmasters are skilled warriors who have found a way to befriend a spectral canine companion. These fighters are often exceptional team players and work well with groups. They cause panic and confusion in the ranks of enemies with harrying bites and blows. Houndmasters grow in strength alongside their hound and eventually develop an unbreakable bond. Some scholars believe that parts of the hound’s soul and the soul of its master mingle together to build this bond.

Hunting hound

At 3rd level, you obtain a loyal, spectral hound that aids you in and out of battle. The hound uses the statistics for a wolf with some modifications based on your level. The hounded uses your proficiency bonus rather than its own. In addition to the areas where it normally uses its proficiency bonus, your hound also adds your proficiency bonus to its AC and to its damage rolls. Your hound gains an additional d8 hit die at 5th, 7th, 11th, 13th, 15th, 17th, and 19th level.
The hound obeys your commands as best it can. It rolls initiative like any other creature, but you determine its actions, decisions, attitudes, and so on. If you are incapacitated or absent, it acts on its own.

Set up strike

At 7th level, you and your hound become a masterful team. Weapon attacks you or your hound make against prone creatures deal 1d6 bonus damage of the same type as the weapon used. Also you gain the ability to strike down enemies. Every time you make a melee attack you can try to trip someone as a bonus action. They need to make a str save dc: 8+str+proficiency bonus. 

Guard dog

Beginning at 10th level, your hound gains the Protection Fighting Style. It does not need to use a shield to use this Fighting Style

Pack tactician

You gain the pack tactics ability

Life dept

life Debt
At 18th level, when you or your hound are reduced to 0 hit points or fewer by an attack,
the act of violence deeply affects you or your companion. You or your hound gain advantage on all attack rolls against the creature that reduced you or your hound to 0 hit points or fewer, gain resistance to bludgeoning, piercing, and slashing damage, and deal 2d6 extra damage with your weapon attacks for 1 minute.
Once used by either you or your hound, this feature cannot be used until you both complete a long rest.