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Serena Williams Pens Heartfelt Goodbye To Her 'Angel'

Sadly, it's a feeling almost every pet owner can relate to.

On Tuesday, tennis champion Serena Williams gave an emotional farewell to Jackie, her beloved Jack Russell terrier, in a series of Instagram posts addressed to her "angel."

A photo posted by Serena Williams (@serenawilliams) on Nov 24, 2015 at 10:52am PST

"Today really is hard for me," wrote Williams. "My special friend [who] I got at 17 (2 weeks before I won my very first Grand Slam) left me today."

According to Williams, Jackie passed away Tuesday morning at the age of 16, having been with the tennis star for nearly half her life.

"I got out of the shower this afternoon and she was not there to lick my leg as she always did everyday to remind me how much she loved me," she continued. "I feel so lucky to have such a special friend."

Williams closed out her message by imploring other pet owners to appreciate their animals while they're still here.

"Give your dog, cat, pet a big hug," wrote Williams. "Jackie Baila Pete Williams I will miss you and your memory will live forever."

Read Williams' entire touching farewell below:

Today really is hard for me. My special friend in which I got at 17 (2 weeks before I won my very first Grand Slam) left me today. She was 16 years young and up until a few days ago was still sprinting. Her poor body gave out this morning and she had a way of telling me it was time for me to be brave and let her go. With my dad by my side we were able to say a loving goodbye. She was with me from 1999 until today and I miss her so much. I got out of the shower this afternoon and she was not there to lick my leg as she always did everyday to remind me how much she loved me. I feel so lucky to have such a special friend. Give your dog, cat, pet a big hug. #breakingheart #bff Jackie Baila Pete Williams I will miss you and your memory will live forever.