'SimonSits' Creator Isabel Klee Tearfully Reveals Her Dog Simon Has Cancer

 Isabel Klee has shared an emotional update about her beloved internet-famous dog, Simon.

Klee, known online as @SimonSits, where she documents her work fostering dogs, posted a video on Instagram on May 21 revealing the difficult news that Simon has been diagnosed with cancer.

In the emotional clip, the 32-year-old creator explained that she had recently been feeling strong before breaking down in tears as she spoke about her dog’s condition while sitting on her couch.

She shared that Simon, a mix of Jindo, Miniature Pinscher, and Portuguese Podengo, had been in the ICU for several days. Klee also referenced a previous update, explaining that Simon had been experiencing seizures, including four episodes within a five-hour period earlier that morning.

This continuation explains how Simon’s condition escalated from uncertain diagnosis to a strongly suspected cancer with neurological complications.

The vet team eventually determined that the liver mass was growing in a pattern consistent with cancer, and they warned that this type of cancer often has a high risk of spreading to the brain. To get a clearer picture, they ran more advanced imaging— a CT scan of the liver and an MRI of the brain. Those results brought some temporary relief: at that point, there was no evidence that the cancer had spread to either the brain or the lungs.

However, the liver tumor itself was still causing major systemic problems. It was interfering with how Simon’s body processed his seizure medications, which likely explains why his cluster seizures became more frequent and more severe. They were essentially caught in a cycle where the tumor worsened his medication control, and the seizures reflected that instability.

The emotional part of her statement focuses on quality of life decisions. She is weighing treatment versus comfort, and expressing that prolonged survival wouldn’t matter if it means Simon is heavily sedated or not himself. In veterinary care, this is often a key decision point: prioritizing a shorter time with better awareness and comfort over longer survival with significant decline.