It has been confirmed multiple times that the trailing dogs brought in initially were DOJ Bloodhounds from the prison. And yes, IMO those are NOT the right ones. It has also been stated multiple times that they could pick up a trail. This is not because there was no trail, but because they couldn't. There is a trail there, several of them, it was his house. KWIM?
SAR area search and HRD dogs were brought in later. Obviously the area search dogs have not found him. The one component we don't know anything about is the HRD dogs. They have not found his body, we know that. We do not know if they have been used in the house, to check the cars, to check all around the house and nearby houses. If they were used for these things we certainly don't know what if anything they found. There are only a few FEMA dogs on the list of dogs that they called out, and I don't know if they were actually on the ground or not, so I can't speculate as to the effectiveness of the dogs. It is entirely possible that the HRD dogs found evidence and we just aren't hearing about it.