I had 3 people join in for 1 session last month, and for one I designed a business consultant mage with 3 Hell Hounds. They were combat-trained using Running Wild rules but with halved threshold, as a pack, and also had their skills increased. So you had 3 Hell Hounds with the benefits of a TacNet II (as conversion of the sr4-tacnet-like ability of a pack), 3-hit Increase Intuition, Increase Agility and Combat Sense quickened, and +50% on their offensive, perception and tracking skills.
Needless to say, tracking down some escaped paracritters was rather easy with three 15-dice characters teamworking.
Hell Hounds are expensive as hell, but if you can get a few normal guard dogs packtrained, which costs a significant extra amount, and get some custom armor fitted for them, they already can be a nice deterrent.