The dog is a reference to the Punisher comic series. "Punisher: War Zone"; in one issue the Punisher rescued an abused guard dog named Max from its criminal owner.
When Melvin Potter becomes alarmed for his safety after fearing that Matt was followed to his workshop, he quickly picks up a saw blade as a weapon. In the comics, Melvin is also known as the "Gladiator," a criminal who uses saw blades as weapons with his costume.
Foggy refers to The Punisher as "Killdozer." Killdozer is the name of two characters in Marvel Comics, the first is a killer bulldozer and the second an armor wearing member of the Iron Trinity.