Puppies capture hearts with their endless curiosity and boundless energy. But in little Mila's case, her excitement is a big problem. Erika and Ryan Lil say whenever Mila would get worked up, she'd fall fast asleep. "I didn't know what it was," Erika told Inside Edition. "Her whole body just loses function, her feet give out from under her, she'll pass out," she added. The couple took the pup to the vet, who diagnosed her with a rare neurological condition. Mila suffers from Cataplexy Narcolepsy. It's extremely rare, but fortunately she's not in any pain! Her family loves her and takes great care of her.