Volunteers estimate they have canvassed a hundred square miles since Sammy, a young pitbull mix, went missing on the northwest side early Sunday.
They have distributed hundreds of flyers and have even started posting flyers on the backs of their cars so his plight gets more exposure when they drive around town.
Sammy was being boarded near Prince Road and Interstate 10 when he went missing.
Julie Daniel, who adopted Sammy in February from sol.DOG, thinks he may have gotten spooked and gone looking for her.
Pit 'n Proud, a pitbull advocacy group, has created a Facebook page — The Search for Sammy — both to help coordinate volunteer efforts and to spread awareness about the search to as many people as possible.
"This Facebook page they started has given me a lot of hope," Daniel said.
There is also a $1,000 reward.
Daniel says Sammy is nearly 2 years old. He's very friendly and answers to his name. He has white on his neck and chest, and was wearing a blue collar. He also has very distinctive ears. He stands about knee-high and weighs about 60 pounds.
"He's a really a sweet dog. I think if someone were to call his name, especially if they had food, I think he would go to someone," she said Tuesday afternoon, noting he may be more likely to approach a woman.
Daniel adopted him in February from sol.DOG, which also has volunteers out looking for Sammy.
"They've been amazing as far as organizing a search. I don't even know how many people they have looking right now... every time there's a possible sighting they run out," Daniel said.
She adopted Sammy from sol.DOG because she had been taking her dog Lily there for training, and then started volunteering. That's when she met Sammy, who was being fostered and needed a home.
So far, there have been a few possible sightings but no concrete leads.
The search has led to the rescue of another dog — an emaciated small poodle. Volunteers planned to nurse the little dog found back to health while they also searched for his owners.