While I did not tend to the wound myself, I did learn from the vet when Budro was bitten on the hind end by a very large Bull Mastiff... a deep puncture wound (such as a bite from something with BIG teeth) should not be closed up as apposed to a laceration. Deep wounds need to drain as was mentioned about the tear drop at the low end of the wound.
Shaving the area is important also.

Rick H...