Please help me find my dog Elton

Hi my name is Benny and yesterday at 9am on 7/27 my dog Elton went on a hike with his walker and 6 other large dogs, our walker (who we’ve had for over a year) was always instructed to NEVER take him off leash. She stopped to give him water and took him off his leash then let him run down a hill with the other dogs, she turned her head for a minute and he was gone. We went the first day with 15+ people and searched everywhere. The area where he was lost was the Victory Trail in Woodland Hills, it’s covered in brush with foxtails and weeds up to your neck. I searched through the brush for hours. I’m starting this gofundme so i can hire someone with an infrared drone to hopefully find him, and/or a bloodhound who can track by scent. UPDATE - we hired the bloodhound and she took us around the neighborhood, they believe someone may have him. We need continued funds for advertisements and search help. I can’t stop until I’ve done everything this is my last resort. Please help if you can