Serena and Jackie Photo: Serena Williams

One of Serena Williams’s extensive menagerie of very cute animals (who are probably also canine tennis pros themselves) died on Tuesday, and when Serena mourns, we mourn. Jackie, Serena’s 17-year-old fluffy, white-haired pup, whom she’s had since 1999 and who watched her win her first Grand Slam, is now watching Serena defeat tennis records from dog heaven. The pro wrote on Instagram:

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.

Jackie Baila Pete Williams is survived by siblings Laurelai and Chip Williams and mother Serena. Rest in peace, bud.