Roloff, 57, opened up about her canine companion's death on her Instagram last week, writing alongside photos of the pup, "This is a hard post for me. Im not even sure what to say."
"My little fella Felix fell suddenly ill and past [sic] away the Thursday Before our wedding in August," Roloff continued. "With my wedding two days away I didn't have time to grieve. I was devastated and couldn't believe he was gone."
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The TLC personality said that even after "a month and a half I'm still so sad."
"I miss him so much," she added. "Felix you will always be the best dog and furry friend. You were loved 💙🐾💙 and always will be."
Roloff concluded her post with the hashtags: "#myrescuedog #loveyouforever #hewassixyearsold #bestdogsever #willmissyou."
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Roloff married now-husband Chris Marek on Aug. 28 at Roloff Farms in Hillsboro, Oregon. The wedding was attended by 146 of their closest family and friends — including her four children with ex-husband Matt Roloff: twin brothers Jeremy and Zach, 31, daughter Molly, 28, and youngest son Jacob, 24.
"Our wedding day is a special day, but our marriage is a lifetime together," she previously told PEOPLE of her nuptials. "I'll have the rest of my life with Chris and that makes me smile."
"[It was challenging] planning a traditional wedding and all that typically goes into that, to what we want to have at our wedding," she added. "Sometimes it felt like the two clashed at times for me. But in the end, it's about the two of us — Chris and I. It's about combining our two lives together into one and sharing it with our family and friends."
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For the ceremony, Roloff also paid tribute to her later mother by incorporating a special piece of jewelry into her wedding look, which included a dress from Justin Alexander's Sincerity Collection and sparkly pumps.
"My mom passed away in September 2019," said Roloff. "I got this bracelet when she had passed away. This bracelet came from my great-grandmother who gave it to my grandmother who gave it to my mom. And then I got it. So I wore it as a symbol [of my mom being with me]. And so that was my something old. It's a diamond bracelet with some sapphires."