Fitz's H40 Optimized Arbi - Dog Break The Line
 Arbites Build - Warhammer 40k: Darktide 

This build uses the gunner prio to extend your dog's effective range. Otherwise, just ping the target in line of sight or let the dog do its thing and spend that talent point elsewhere (True Grit or Voltaic Mandibles).

Shock Mines Lone Wolf Arbi has fallen out of favor recently because 1. mines were nerfed, 2. modifiers that negate mines have been active (Final Toll), and 3. the dog can interrupt things that you can't with shmines, like mutants, dog pounces on yourself, Chaos Spawn grabs, Chaos Spawn grabs on other players with Remote Detonation, Daemonhosts with RD, and dogs pounce human-sized enemies with annoying modifiers, including Final Toll (red), Contaminated Stims, and Rotten Armor (stinky).

That's why I suggest this over Lone Wolf in the current environment plus having a dog is wholesome chungus 100 moment. That said, if the things that I mentioned change or you're still on your Lone Wolf alpha sigma grind, swap to Shock Mines and swap to Forceful with Will of the Lex and Targets Acquired.