If the guide only searched for a few minutes he did not do the job he was paid to do. My uncle used to work as a guide down in South Texas and they used to use dogs to track and find any animals shot that they couldn't find after about 30 minutes. Where I hunt we have searched half the night to find a hog or deer we shot. We've crawled through the brush on our hands and knees with flashlights looking for blood spots to find them. We've had to search for as long as 4 hours to find a hog. We mark the trail as we go and if we loose the bloodtrail we look back at the general direction it was travelling and try to look farther ahead to pick the trail up again. We'vefound a few hogs by doing that.With a hog they normally don't go far though they don't bleed alot externally because if the fat so you don't have a very good blood trail to follow a lot of times. We've found them alot of times piled up in thick brush where we walked right past them the first time and didn't see them.