How to counter Bounty Hunter

In lane

Gyrocoptersupport
• Gyrocopter has high movement speed and can stop Bounty Hunter from pulling the wave. • Rocket Barrage + Homing Missile is always a kill on a Bounty Hunter playing away from the lane. • Homing Missile keeps following Bounty Hunter after using Shadow Walk.

In game

Slark
• Slark can dispel Track with Dark Pact. • Slark has good night vision. • Slark can sense when Bounty Hunter is stalking him - the passive part of Shadow Dance will be disabled.

Items

Dust of Appearance
• Bounty Hunter is an invisibility hero and having this item in your inventory can be the difference between a kill and wasted time.
Sentry Ward
• Bounty Hunter likes to roam while invisible. You need well-placed sentries to anticipate and read his movements.
Gem of True Sight
• Consider buying an early Gem of True Sight to counter his and his team's movements.
Lotus Orb
• You can buy this item to dispel Track off your allies.

Notes

Bounty Hunter does not have natural counters right now - you counter him not with heroes, but with gameplay. You need to be wary of your courier paths and to try to read his movements. Don't let him and the enemy team snowball with Track. Heroes that can stop him from pulling the wave are also good (supports with slows, damage or stuns). However, this is easier said than done and that's why he has been banned in the later stages of TI15.