Dog tale

What do you call a pet that disappears?
Lost?
The neighbors haven't seen it.
The pound, humane society and local vets haven't seen it.
The owner puts flyers on her car, asking people if they have seen it.
An anonymous call comes in pointing out Ivan.
I find Ivan's house. Ivan isn't home. Neighbors have seen Ivan with the dog, trying to sell it, complete with a story his ex wife gave it to him.
I attempt to contact Ivan and leave a card.

While off-duty Ivan is contacted, the dog is verified as the "missing dog". Ivan tells the other deputy that he found dog in the area it was lost. it jumped into his car. he says he left in his buddies yard for a couple days, next door to the owner's house, it went unclaimed. he didn't try to contact the pound, the humane society or any vets and admits to wanting a reward.

The ex-wife calls in, alerted by someone, the ex, Ivan, said he got it from her. ex-wife, denies stating she saw him with it and "a buddy gave it to him". Ivan tried to give the dog to their daughter and sell the dog to his sister.

I am attempting to contact Ivan again to verify his story. None of which seems believable.