Famous foster mom's final goodbye to her beloved senior dog has everyone sobbing: 'I'm so grateful to have been his mom'

Over the past couple of years, the TikTok community has fallen head-over-heels in love with NYC dog foster mom Isabel Klee, who's famous for taking in pups who have little to no chance of getting adopted. Whether it's a medical foster, a dog with severe behavioral issues, or a senior pup who might not have much time left -- Isabel opens her arms and her home, giving these tiny souls a chance to heal and experience real love.

Of course, Isabel isn't alone in her journey. Her amazing fiance Jacob is right by her side to comfort each and every animal -- as is her beloved and trusted sidekick -- her senior dog, Simon.

Sadly, as anyone who follows Isabel already knows, Simon suffers from epilepsy and has also been battling liver cancer. And earlier today, Isabel shared a heartbreaking update with her followers, letting everyone know that she and Jacob have made the heart-wrenching decision to help Simon cross the Rainbow Bridge this week.

Get the tissues before watching her beautiful, yet heartbreaking message explaining what's happening with her beloved pup. Actually -- you might want to grab the whole box.

As one of my fellow co-workers said to me a little while ago, "This broke me." Honestly, I think thousands of people all over the world are sharing in that same sentiment right now, which is evident from the comments on the clip.

"I’m so so sorry. It’s the last gift you can give. We will all be grieving alongside you."

"The final act of love is letting them go in peace and not suffering ❤️‍🩹"

"Just bawling. Absolutely love Simon. You are being so selfless. Hardest decision. Big hugs and much love to you all. You do not grieve alone. Thoughts with you all."

"Oh Isabel, there are no words ❤️‍🩹 we grieve with you. Thanks for loving him and giving him OUR love 💔"

Simon's Legacy of Helping Other Dogs Heal

All dogs are a gift, and they're all special in their own way. But there's just something so unique and magical about Simon. It's like he was put on this earth to remind heartbroken and forgotten animals that they are important, loved, and that they matter. With each foster Isabel brings home, he instinctively knows how to approach each one and reassure them that everything is going to be ok. If there truly are angels here on earth, Simon is an angel in dog form.

Take Tiki, for example, the little pup who was so fearful and shut down, he initially hid from humans. Somehow, Simon helped draw him out of his shell -- and he taught him how to be a dog again.

Then there was Darla, who Simon taught how to play again... just look at how relaxed and happy she is to be with him.

Even in Simon's final days, he was there to comfort and love a new little friend, Fluffy, who was staying with Isabel and Jacob for one night.

In an odd twist of fate, Fluffy seemed to sense that Simon was unwell, and he gently started to care for him.

I know I'm not alone in sending Isabel and Jacob so much love, strength, and wishes for peace this week as they spend Simon's final days showering him with all of the adoration, comfort, joy, and affection he showed to so many pups over the years... Not to mention the pure happiness he brought to so many people across the world when he popped up in our social media feeds each day.

He will be so missed but never forgotten, and his legacy of unconditional love will remain a source of inspiration forever.

We love you, Isabel, Jacob, and Simon. Thank you for being the bright spot in all of our days and bringing love and joy to so many.

Related: Famous Foster Mom Adopts Dog Right Before He Passes and Brings Entire Internet to Tears