In the post, the podcaster and media personality said: “Rest in peace our beautiful Winnie. I’ve had Winston for almost 14 years and he’s been an huge part of our family.
“He’s helped me through lots of life changes, always there for us.
“I knew I would be sad when we lost him but I didn’t anticipate just how sad.
“We are heartbroken but I am so thankful I was there with him when it happened.
“There will never be another dog like you Winston you were one in a million. Sleep well our little best pal.”
Williams published her memoir Big Mouth in May, which dives into the “ups and downs” of her personal life as well as her career.
The star is originally from Howth, Co Dublin, although she moved to Scotland with her mother while still in school.
She was later cast in the reality TV show Fade Street, which followed the personal lives of a group of young adults aged 20 to 29 while they navigate Dublin life.
Vogue now lives in London with husband Spencer Matthews and three children.
Spencer and Vogue met while filming Channel 4’s reality ski jumping show The Jump in 2017. While Vogue had to withdraw from the competition due to an injury, their relationship blossomed and the pair soon became an item.
Spencer popped the question the following January when the pair were watching The Lion King on the West End in London in 2018. They married in June of the same year, walking down the aisle at Spencer’s family’s 10,000-acre Scottish estate, Glen Affric.
A month later the pair announced that they were expecting their first child together. Williams then gave birth to their baby boy Theodore in September 2018. They went on to have a daughter Gigi and son Otto.
The pair had a second wedding in in London the following year after which was documented on the E4 show Spencer, Vogue and Wedding Two.
She previously hosted a podcast with Matthews titled Vogue and Spencer. However, he has since left the podcast which Vogue now hosts with her sister Amber Wilson.
The star also currently hosts the My Therapist Ghosted Me podcast with Joanne McNally.