More than a few times, we've had trouble locating Layla in the house. The Princess has also taken to wandering off if we take her outside at night -- even when we're right there, she'll head down the hill, trundling as fast as she can go. And that's pretty amazingly fast for a 15 year old girl! Since she's deaf, there's no calling her to get her attention. Sometimes I think she really has located the Tardis and headed into another dimension.
So DH got a Tile for her collar, which he linked to an app on our phones. Now all we have to do is hit the locator, and she rings like crazy. And since she's deaf, it doesn't bother her a bit. What a relief to know Layla is only a phone call away!