Conor McGregor is 'so heartbroken' after revealing that his beloved dog Hugo has died

Conor McGregor shared his grieving process with the world after announcing on Wednesday that his dog Hugo had died. 

The 33-year-old MMA superstar shared a bevy of sweet photos with his 42.7 million followers of himself bonding with his late pooch.

The fighter said he was 'so heart broken' over the loss of the animal who had accompanied him through much of his rise to fame.

Conor opened his Instagram post with a cute snap of himself in his underwear while passed out a bed frame covered with a comforter but no matters as Hugo relaxed next to him.

'So heart broken to say my dog Hugo has passed away, he began his caption.

'He was with me all the way, my closest companion. From sleeping on a bed frame without a mattress to everything else that came after,' he continued. 'Thank you for all the work put in alongside me to get this life correct for our family. All the love and cuddles we will miss forever and ever our Hugo! Gutted [broken heart emoji]. RIP the best boy Hugo McGregor [praying hands emoji].'

Hugo seems to have been a regular workout partner for Conor, as they were shown together on runs in several photos.

The sweet dog also baby sat his three children, including Conor Jr., four; Croia, two; and Rían, five months. 

The panting canine glanced at the camera in one odd photo as Conor took a ride on a stationary bike outdoors with one of his children at his side in a stroller.

Hugo was docile enough to let the children care for him, and Conor Jr. had him on a leash as they went for a walk with Croia in a cute snap.

The photos gave the impression that the fighter and his dog were inseparable, and Hugo was seen hanging out with Conor as he lifted weights in another photo. 

A second loving post featured a video of Hugo perched nobly on a white sofa while Ed Sheeran's song Runaway played on the soundtrack.

'We got there in the end my boy,' Conor captioned the clip.

Another short video shared in his Insta Stories showed the UFC fighter in closeup as he announced he was about to take his daily 10km run with the dog running by his side.

In the comments of his post, Conor's friends and colleagues shared their condolences.

The Irish football coach Robbie Keane commented, 'I know how you feel pal,' while MMA fighter Dillon Danis wrote, 'Sorry brother he will be missed ❤️.'

Among Conor's posts were some adorable photos of Hugo when he was just a puppy.

The fighter appeared to have gotten the dog back in 2011, based on how small he was in photos dated to that summer.

He was seen with one of Conor's other dogs in a photo of him as a puppy, and then years later when he was fully grown in another sweet snap.

Conor's fiancée Dee Devlin also appeared to have a strong relationship with the pooch.

The couple have been together since 2008, and they most recently welcome baby Rían in May.