The youngest of the Wolf Pack, Rain Brown, revealed on social media that she and the rest of the Alaskan Bush People are grieving the loss of their dog, Mr. Cupcake. He immediately became a close member of the tight-knit family. After an intense year, which included losing Billy Brown, the Browns now have to deal with another heavy loss.

Rainbow is the youngest sibling and daughter of Billy and Ami Brown who grew up in front of fans' eyes. Discovery viewers will recall watching her grow from a young girl into an adult overnight. In a matter of years, she went from shy and reserved to a woman who loves makeup and has her own fashion sense. She and her sister, Snowbird, could always be found playing with their dolls together or caring for the animals. She was often coddled by her mother, Ami, since she was the youngest. At 18, Rain eventually wanted a bit of her own independence and finally was able to build a home of her own on the family's sprawling property.

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Mr. Cupcake joined the family and the show back in 2015 as a sprightly pup. The Belgian Tervuren instantly took to the wilds of Alaska and became quite a good guard dog when it came to unwanted intruders like bears. During a recent episode of Alaskan Bush People, fans heard three gunshots in the distance, which is the Browns' code for danger or trouble. Sadly, Bird revealed that Mr. Cupcake was gone, saying he just didn't wake up. Rain took to her Instagram page to share some precious photos, with fans saying, "Love you forever, cupie." Check out Rain's post below:

Mr. Cupcake was first found by Billy, who had been searching for a pet for his two daughters. The dog was known by Alaskan Bush People fans for being extremely intelligent, protective and family-oriented. The sheepdog loved the entire family but often gravitated towards Rain and Bird. Mr. Cupcake was an official member of the cast who even had his own bio on Discovery's website, which read, "Mr. Cupcake, a spirited young pup who is eager for adventure and always looking for his next chew toy."

This is the second major loss for the Browns, who just said goodbye to their father in February. The newest season has been showing the last few weeks of Billy's life, which includes the family trying to rebuild after the Palmer Wildfires. Currently, some big changes are going on within the family as Gabe just welcomed his second daughter into the world. Noah is also getting ready to welcome another baby any day now. While the family will miss Mr. Cupcake, they are happy to know that he is now in heaven with Billy, watching over them together.

Alaskan Bush People airs Sunday at 8pm on Discovery.

Next: Alaskan Bush People: Fans Are ‘Disgusted’ By Bird And Her Cats

Sources: Rain Brown/Instagram, Discovery