DOG TRAPPING TIPS: How to catch a shy street dog.. 

• Set up a feeding station in a protected, shady spot where you often see the animal. The food will keep her in the area. Fill a a cake pan with water (a moat) and put a food bowl with smelly wet food in the middle. (This station provides food/water and keeps out ants.)
• Call animal control and report the location of the animal - (if they're effective.)
• Borrow, rent or buy a humane trap. Traps can be ordered online, purchased at feed stores or borrowed from humane societies. (www.trucatchtraps.com)
• Inspect your trap to be sure it is functional. Oil it, test the trap plate, inspect the welds to be sure the wire is secure. You often get only one chance!
• Third, remove the feeding station a day or two before you replace it with the trap. Post a notice asking other people NOT to feed the animal.. its very important that the animal be HUNGRY! Set the trap where you had been feeding.
• Find a flat surface so the trap is level. Place a chunk of wet food outside the trap door. Line the walkway of the trap with newspaper and drop chunks of wet food to entice the animal to walk in. Place a big portion of food on the trap plate. (If ants are a problem, dust the trap area with sevin dust.) Keep the food fresh and smelly. Oily food works best. (tunafish in oil, bacon, bbq, brisquit fat or deboned fried chicken works great!)
• Once you trap the animal, keep her IN the trap. Go straight to a vet or shelter. If you choose to foster the animal, have the vet remove the animal from the trap. Get her vaccinated, spayed and have the vet attach a harness/tags and leash while in surgery. 
• When the animal wakes, it will be ready to go to its foster home. Slowly acclimate it to a quiet room and secure yard. If its a dog, keep her on a leash at all times. Do not let the dog into an unsupervised yard until you KNOW she will return to you.