"He was with a family, it looks like it was three small children. ... He kept hearing them say how big he is ... how big he is ... how big he is. He knocked over the kids a few times. He was in training for some kind of fighting," she said.
"My sense of him ... his people thought he was going to be a fighter ... but there was no way that aggression could be trained into him," Diener said.
Diener continued to relay the information, which she says comes to her intuitively, telepathically.
"There were other dogs around. ... There was lots of noise. Lots of frenzy. ... He's not reaching these conclusions, but I can reach these conclusions - that these dogs were in training to fight," she said.
Apparently, she said, when Ace showed little spirit for that, the family let him go.
"He was riding in a car, and the door opened. I don't know whether he jumped out or they kinda tossed him out. ... Whether they looked for him, or whether they just left, he doesn't know. But that's his experience," Diener said.
"It wasn't in his immediate neighborhood. ... He was rummaging in trash cans. He's a survivor, no question. He traveled a good piece, is what I'm getting from him. He was searching, and then he got trapped.
"He knew what was happening. He knew his days were numbered. They talk in the shelter. ... They know whether it's a kill shelter or not a kill shelter, because they hear what everybody is saying."
I asked Diener what Ace's name was before he landed in the shelter. She paused for five seconds, looking at him, and said, "I don't know that this is accurate, but I'm getting something like 'Carper.'"
Upon hearing that name, Ace, whose attentions were elsewhere, perked up, looked at Diener and walked over to her. "Carter or Carper, something like that," she said.
Then it got stranger.
"I don't know where you are on the whole idea of reincarnation, but you two have been together before," she said.
"Do you have any memories of other lifetimes when you were in a war?" she asked. "I think he was a service dog. He was a dog that you cared for as part of an Army thing."
Was I buying all this? Not entirely. I didn't totally discount any of it, either.
Diener is used to skeptics - or worse - but those aren't the ones she's working for.
"When I first started doing this, I was much more concerned about people thinking I'm wacky. But now it's like, this is my work."
Some of what Diener said impressed and surprised me. Some of it brought out the cynic in me. But on one point, she couldn't have been more right.
"What happened earlier really doesn't matter," she said, "because he's here for you now."
Tomorrow in Modern Life: A mystery solved