Teigen, 32, announced that their bulldog had passed away in an emotional Instagram post.
“Today our baby, Puddy, has gone on to the pup heavens. John and I got Puddy in our first year of dating, when I convinced him half-birthday presents were a real thing,” Teigen wrote.
The pregnant model explained that Puddy joined their family ten years ago and was with them through "every up, down, new house, new city, new tour, new travel."
She continued, "He welcomed new pups and loved on new babies and new bellies. He was there for everything. Every time I needed a taste tester, someone to kiss or needed to sob into his stinky rolls, he was there. It’s true what they say.
"We are their entire lives and it is the greatest shame that they can only bless us with a short spark of time in ours. I always knew I would lose a piece of me when he left us. I feel the hole now. I will love you forever, my boy. My heart aches. Thank you so much for everything, everything."
The expectant mum also shared a video of Puddy with the couple's daughter Luna when she was a baby.
"I love you. I will miss you every day," she wrote.