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The actor, 43, took to Instagram yesterday afternoon to ask followers for help, explaining his heart is broken at the pup's disappearance.
"MIGHTY IS MISSING," he wrote.
In Montecito California he is chipped and his collar has a number to call - if you take him to your local vet or shelter or police station he can be traced back to me for a reward please only send REAL INFO my heart is already broken so please don't add insult to injury."
Orlando welcomed the little pooch during his separation from now-fiancée Katy Perry, back in 2017. In fact, fans actually thought the pup was Katy's - as it bears a striking resemblance to her teacup poodle, Nugget.
However, photos later emerged of the pups together after Katy - who is currently expecting her first baby - and Orlando got back together.
It seems Orlando is completely smitten with little Mighty. In February, he posted a carousel of images of the pooch at Milan Fashion Week, sitting front row at the shows and mingling with other A-list celebs.
"Mighty did #mfw like a @boss," said Orlando.
It's clear Katy and Orlando are big animal people. During lockdown, 35-year-old Katy posted about her own pooch Nugget, writing: " I don't know about you, but I am so grateful for my dog at this moment.
"She and I are going to be watching @AmericanIdol together tonight, so cuddle up with your favorite pet, stuffed animal, pillow, or canned good."
And the pop star was devastated when her kitty of 15 years passed away in April.
"Kitty Purry crawled through my then-boyfriend's window 15 years ago, fully pregnant and seeking shelter," she wrote at the time.
"Two litters and many moons later, this street cat became a lovable mascot to many. Sadly, Kitty completed her 9th life last night.
"I hope she rests in salmon fillets and tuna tartare way up in catnip heaven. Kitty, thanks for the cuddles and companionship along the way."
We hope little Mighty is reunited with his family very soon.
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