The heartbreaking announcement was accompanied by a reel of photos featuring the family pup over the years.
He was also grateful for their time together.
“So so many great memories … grateful for all of them.
I miss you already sweet boy,” he closed the post.
Thankfully, Mathison was able to catch it early.
He is now living cancer-free after undergoing a potentially life-saving kidney surgery.
The death of his beloved dog came less than a year after Red’s initial cancer diagnosis.
He was subsequently prescribed medication to help ease the pain.
Fortunately, the medication did as it was intended and lessened Red’s suffering.
