I am NOT yelling, I am just being VERY emphatic. Please don't be offended, this is very important!
Those are VERY HIGH PREY DRIVE dogs! Strap or screw that cage down to the table, and put a lid on it with weights on top of that. Then PUT THAT PIGGIE CAGE IN A ROOM WHERE THE DOGS CAN'T GET TO IT!!!! Keep the door to that room CLOSED! Your piggies are dust if those dogs get them again.
Meanwhile, you should wash any cuts out with mild soap or dish detergent, dab-don't rub-with a paper towel to dry the area, and put a thin smear of neosporin (triple antibiotic) on the open areas. Watch closely for redness, swelling, or red streaks in the open areas which indicate infection and require emergency care.
I'm sorry this happened to your piggie. Dogs are very determined, and very dangerous to any small animal they view as prey. Please don't take any chances. If you leave the house, and the dogs are unsupervised, they WILL get your piggies.