(Note: This is written by someone who has A LOT of experience looking for and finding lost shelties.)
These suggestions that follow are actually a lot of different people's thoughts.
Do large posters 14X21 in very bold print, that could be seen by a passing vehicle, with a telephone number of someone immediately available to check out a sighting. Make it brief, no long explanations on why the dog got loose, etc. No small size signs. You want someone driving by to be able to see the phone number easily, so that if they spot the dog they could call from a cell phone. Put "PLEASE DO NOT CHASE!" on your signs, as a chased sheltie will run like the wind! Try writing big red letters on poster "BELOVED Child's PET." Maybe you'll tug at someone’s heartstrings if they think the dog belongs to a child. We all have this feeling of sadness and helplessness. People almost always will try to help a lost "sheltie"...say "sheltie" on your advertising mode, but also in smaller print say "miniature collie"...because some people are NOT smart enough to know what a sheltie is. We care not about semantics at this point in time, call it a miniature collie!
POSTER ATTACHED....... we use two 8 1/2 x 11 sheets of paper, one on the top and one on the bottom with a picture of the dog in the middle. We cover the whole poster with clear "Contact" shelf paper. This makes the poster waterproof and it'll last for weeks.
Another option instead of handing out flyers.
This day in the age of computers it is easy to do your own business cards. I make up cards with the dog’s picture, the date lost, where lost, phone numbers ... and hand those out to children, people out walking their dogs, running, riding bikes etc. Sometimes they throw away flyers, where they'll
Talk to the local delivery people, mail men, oil companies, electric companies and ask them to keep an eye out for the dog, give them one of those business cards with the dogs picture on it. Seek out every child in the neighborhood (kids always know where the dogs are on the street) and give them a flyer or business card with your number. Post one at the school and play grounds. If someone in this category helps you find the dog, it is nice to give a reward, no matter how small.
Then if somebody happens to see a dog they "will" pay attention.
When someone calls with a sighting, you must go NOW, not hours later...Dogs, especially shelties, do not meander around the same place usually, they seem to be "going" somewhere. Either back to their hideout or a new hideout.
If you get sightings don't chase him, you'll just chase him out of the area. Try to keep him comfortably in the area he is spotted in. Find a place to feed him, so that he feels he can comfortably come back to that spot for food...and then try to beg, borrow or steal a humane trap. Because he is a sheltie he isn't going to go to a stranger to start with, and with his mind set now EVERYBODY is a stranger. The only way you are going to get him is if he happened to run into somebody's yard and gets cornered, or he goes into a trap.
When he finds a hideout, it may take several days for him to get comfortable enough to come out... THAT's why you get the large signs out and flyers or business cards to a lesser extent. I think the big signs get to way more people than you can cover with flyers. When he gets hungry and starts to venture out to look for food...people will call... then you do putting the food out and setting the trap.
If you are thinking someone "has" the dog, because there have been no sightings...Two things. As you are driving around looking...Tape one of those large posters to the back of your vehicle, so everywhere you go, "people" know "somebody" is still looking for this dog, as is not going "to just go away!"
Also, if you suspect the dog may have been stolen, state that the dog is microchipped. If its a bitch, state that she is spayed. Some put "NEEDS MEDICATION" in large print on their flyers and posters. And if at all possible, offer as large a reward as you can afford.
Most importantly - lost dogs do not usually range. They usually stick to one particular area, might be 3 miles in diameter. Now, she might have traveled a couple miles before she got to that area, or she might be around the corner, but odds are if she's loose (and not stolen) that she's either with someone, or she's staked out an area.
For every day that passes that you don't have any calls with sightings, put new signs out approximately 1 mile in each direction.
Create "drop zones" where you can leave food and an article of your clothing so that if she runs across it, she will stay with your scent. We successfully found one of my own dogs that I had recently placed when she escaped her new owners and couldn't be caught. We had reports of her in an area, left a shirt there, and there she stayed until caught (she was terrified and wouldn't go near her new owners). If possible (and she's used to it) leave her crate outside, too.
Since I spend a good part of my day looking for lost dogs, I can tell you, they are really easy to miss. They can be five feet away and you'll miss them, but they are creatures of habit, and even when lost, they stick to a routine.
When you are on foot searching you need to think like a dog. What does she like? Which direction would she be most likely to head? Is there another house/yard in the neighborhood similar to yours? She might be there. If she's crossed a street, she might have a visual barrier preventing her (in her mind) from returning. Follow the lay of the land - which way would you be most likely to go if you were she? Take the path of least resistance. If you come to an area where there is a drainage ditch, or railroad tracks, or high power lines... that is like a highway! Walk it and "quietly" look for the dog. Do not take a chance on scaring her out of the area.
Darla Duffey and Ashley the searcher dog! (She’s gone but not forgotten)
If there are no dogs in heaven, then when I die I want to go where they went!
“With Devotion To The Sheltie World”