Kaley Cuoco is mourning the loss of her dog Shirley — and revealing a tough choice.

In a video posted to her Instagram Monday, the “Big Bang Theory” actress shared that not only had her dog died at the age of 14, but that Cuoco had made the “excruciating decision” to rehome her a few years back.

“There’s something that’s been weighing on me that I think I’m ready to share now,” Cuoco said, before describing how Shirley, who was in her care since she was 6 weeks old, had begun fighting ferociously with her fiancé’s dog.

“We bring many dogs into our home,” Cuoco, who is known to adopt and foster canines and has her own pet company, Oh Norman!, said. “I started to get worried that she would hurt another animal and I needed to make a very, very difficult decision.” Ultimately, Cuocodecided to rehome Shirley,

moving the dog in with her pet handler Tony and his wife Angie. “I didn’t want her to end up in a home that didn’t understand her,” she said.

The actress, who fought back tears throughout the video, said she wanted to share the decision in case other dog owners were going through something similar.

Now that Shirley has died, Cuoco said she wanted to speak up on her behalf.