The phrase "to kill the dog" means to eliminate or get rid of a problem or obstacle.
Sentences with «to kill the dog»
Left untreated, it can kill your dog in as little as 12 hours. (shepped.com)
It's relatively safe in that it won't kill your dog if you don't overdose them, but there's a fine line between too much and just enough. (smartdogowners.com)
Again, please don't kill this dog guys. (collider.com)