Cissy has never run away from home before.
But on Saturday the miniature schnauzer from Iowa did, in order to find the person that is home.
Cissy disappeared from her yard in Cedar Rapids, only to show up about 20 blocks away at Mercy Medical Center.
Her owner, Nancy Franck, has been at the hospital for the last two weeks, after undergoing surgery for ovarian cancer.
But it remains a mystery how the dog managed to find her way back to her beloved 'mom'.
Puppy love: Cissy the miniature schnauzer ran away from her Cedar Rapids home on Saturday, traveling about 20 blocks to the hospital where her owner was undergoing treatment for cancer
'Mom, where are you?': CCTV footage from Mercy Medical Center show the moment Cissy entered the foyer
'She's got to be in here somewhere': Security eventually spotted the dog walking up and down the halls
Searching: The family have no idea how Cissy found her way to the hospital, or knew to go there at all
'We looked up and there was this dog just that was just running across the lobby,' Mercy Security Officer Samantha Conrad told KCRG.
'We started looking at the tags and it had the address and we saw how far away this dog had lived, as far as going at least fifteen blocks to get here.
'So it was quite an amazing journey that this dog made.'
The security guard used the dog's tags to call Nancy's husband, Dale Franck.
Mr Franck said Cissy had been acting weird and he could tell she seemed anxious to go somewhere.
She had been missing about four hours before the hospital called. Video here.