not a heavy spear like a coldsteel boarspear but a lightweight lancetype spear and as far as how, you have to do it matador style, "touch and go" or as i used to call it before i had a catchdog, " Stick and $h!t"
its scary but it is possible if your dogs are in tune with your movements, back when i only had two dogs and niether would lay a tooth on a pig thats how i handled pigs in places that i couldnt use a gun. i wont say it wasnt scary, i know three times that i just had to walk away and whistle like a madman to get my dogs off cuz i wasnt as brave as them.