Mulder was happy. He had Scully, food and water. She was taking good care of him, and took him to awesome walk. He protected her from other people, and generously forgave her for not being grateful about that. She was just a human, after all. Humans always think they can take care of themselves, never appreciating help. So much was clear to him now and he almost wondered how he never realized such simple truths before. Almost. There was no point to waste time thinking, he needed to seize every moment.
Then Scully did the unthinkable. She left the apartment, WITHOUT him. She changed into her formal clothes and shoes, stroked him once and said something he couldn't understand, then she walked out of the door and locked it behind her. Just like that. She left without him!
Mulder barked at the door, but it didn't do much good. He scratched the door and whined, but that didn't work either. How could she forget him? How could she not hear him calling her? Something must have happened! Someone must have attacked her! Maybe she's dead? Is she dead? That would be the only reasonable explanation. If she was alive, she would certainly come back for him!
Scully is dead… Mulder's heart broke to million pieces and he threw himself on the floor heavily, losing the will to live. He vaguely remembered Scully almost dying before. He remembered blood dripping from her nose, but he didn't remember how it smelled. He couldn't remember any smell or sound, and Scully seemed much smaller in his memories. How was it possible? Mulder remembered jumping on her bed and kissing her on the cheek without using his tongue. Why did he do such a thing? What kind of kiss was that? He placed his paw in her hand and wrapped his fingers with hers. Wait, what? He had fingers? His front legs were… arms? Oh my God, he used to be human! Wait until Scully hears that! She will never believe him! Where is she?
Mulder jumped and run through the apartment, looking for Scully, but he couldn't find her anywhere. Everything smelled like her, but she just wasn't there. No one was there, Mulder was all alone in the world, abandoned and forgotten.
He couldn't take it. It was too much! He jumped on the couch and buried his head under the pillow in silent desperation, but it didn't help lessen his anxiety. Angrily, he grabbed the pillow and shook it fiercely, then placed it between his paws and started to rip it apart with his strong jaw. The pillow stuffing flew all around him, but it didn't give him peace of mind. Frustrated, he jumped back on the floor and looked around, searching for a new target. Two plants were soon turned over and he frantically dug in their soil, but found nothing there. Not bothering to clean his paws he rushed to the kitchen, leaving dirty marks all over the carpet. Guided by the smell he found the trash can, tipped it over and took out all of its contents. He ate what was eatable, and some of what wasn't, then got thirsty and went to the bathroom, remembering the sound of water that came from there in the morning when Scully was taking a shower.
Scully! Million pieces of his heart broke each into another million pieces.
He found water in the toilet, had a sad, lonely drink, then went to the bedroom and jumped on the bed, finally taking a rest. He fell asleep on the pillows that smelled more of Scully than any other thing in the apartment (except maybe for the basket with dirty clothes), and his beloved human came back to him in his dreams.
Mulder dreamed of chasing monsters in dark woods and empty buildings, and he never cared if he actually caught one or not, the thrill was in the chase and Scully by his side. If he caught a monster he got a treat from Scully, if he didn't he got to play with them again tomorrow, and if he got hurt he was allowed to sleep in Scully's lap. He was free to go wherever he wanted, and even if it made Scully mad she would still be there waiting for him when he got back.
Then Queequeg came to his dreams and he woke up feeling depressed. Scully had another dog! That's why she left him! She chose that rat over him! How could she! He trusted her and she betrayed him! She took another dog for a walk! She even stroked him, over and over and over again!
It was too much. Defeated, Mulder left the bed and went back to the kitchen. He started to chew the table's leg but it only made him more desperate. It tasted like wood and smelled like nothing. He needed something stronger. Sniffing around, he finally found one of Scully's shoes and started destroying it. It wasn't much of a pleasure, but still better than wood.
As engaged as he was in the shoe business, he didn't miss the sound of footsteps. He raised his head, listening intently, and the footsteps grew louder as they kept coming closer and closer, until they stopped at the door, which slowly opened.
It was Scully! Alive! Healthy and well! She didn't even smell of another dog! She was all his and she was all here! Mulder was delirious. He jumped at her, trying to reach her nose with his, but she yelled at him and pushed him away.
"What the hell happened here?" Scully looked around, bewildered. Mulder didn't completely understand her words, but he understood her tone of voice. She sounded mad, very mad. Why wasn't she happy to see him? Why didn't she let him greet her? What did he do to upset her?
She started to yell some more and Mulder got scared and run to the bedroom, looking for cover. He tried to squeeze under the bed, but was too big for that. The closet door was open and he finally went inside, curled there as best as he could, and shook in fear of his owner's completely unreasonable and unexplainable wrath.