Best Subwoofer Interconnect Cable for powered Wilson Watch Dog

The Kimber Hero is known for it's good bottom end, and is available balanced/XLR. I use a pair on my Rythmiks.

Another vote for the Hero, using them to drive the 15" woofers in my Montana speakers, very good control and definition.

I have had a powered Wilson Watch Dog for several years; it's a great subwoofer. To be honest I have not found that changing the interconnect made much of a difference. On the other hand I think you should consider upgrading your powercord; I've been using the new Synergistic Atmosphere (graphene) high current model to very good effect. You might want to audition this as well as other high current powercords. I think you will get a better sonic return for your investment by upgrading your powercord rather than the interconnect, although you might wish to do both depending on available funds. 

OP-
look into Synergistic Research cabling systems.