How old are they ?
If they are grown, their wounds may not be a life threatening as a little ones would.
If their are puncture wounds, cleanse them with soap and water, peroxide them and leave them open to air, if you put an ointment on them you will be sealing the germs up in the wound.
If the skin is torn open and there are no vital organs and deep tissue injury, you can cleanse them as above, remove any ragged edges of skin, you can dress them with dry 4x4 gauze and vet wrap. Drench the gauze before you remove it the next day to cleanse the area again, if you don't wet the gauze before you remove it, you will mechanicaly take off anything it is stuck to. If you use vet wrap don't wrap it too tighly and cut off circulation, don't cover their vents. Using gauze and vet wrap is almost a 2 people job.
Blue kote spary is good for wounds.
If they are terribly injured it may be best to put them down and not let them suffer.
Good luck.
It is so maddening for roaming dogs to injure or kill your chickens, had the same problem at our house, even though we have a 5 foot fence around our property, the dogs were digging under the fence, finaly had to instal n electric fence to solve the problem, not cheap, but have not had any more dog problems.