*SPOILER*
Here is a listing in order and the amount of people killed by each dog.
Note: This only counts for kills that were shown. Not 'spoken' of.
Mr. White - 5
1. Driving officer of pursuing police vechile.
2. Passenger of pursuing police vechile

3. Joe Cabot

4. Nice Guy Eddie

5. Mr. Orange

Mr. Orange - 2
1. Mr. Blonde

2. Female driver that shoots him.

Mr. Pink - 1
1. 1 of 3 pursuing police officers after escaping heist.

Nice Guy Eddie - 1
1. Marvin Nash

Mr. Blonde - 0
- Although Mr. Blonde is said to be on a "kill crazy rampage" he is not shown killing one person. Although he killed a few at the store. It is not shown.
Mr. Blue - 0
- Drivers do not get many chances to kill.
Mr. Brown - 0
- Drivers do not get many chances to kill.
Joe Cabot - 0
- His final shot did not even kill Mr. Orange. Considering he had already been shot earlier. Joe should have had an easy kill. But failed.