Helping Animals Live Tomorrow Dog Rescue (H.A.L.T.) said the antique phone booth that sits outside of their Rags to Rescue was stolen, according to their post on Facebook.
The rescue group said the booth was a landmark that helped visitors find their store. They said they also had plans to turn the phone booth into a free library.
"It was part of our pet awareness week program where we go into local schools and target 3rd graders in a week long curriculum teaching awareness, empathy and change," the post read.
The group said in June they received a grant from the Californian Foundation to stock the phone booth with children-oriented animal books.
They said they placed their Amazon book order and were planning on opening the library in mid-October in coordination with a paint night for children 10 and under, a pumpkin carving contest and a pet parade/costume contest.
"We are pleading for the return of the phone booth or info leading to it," the post read. "We are completely without words as to why someone would do this. But we are hopeful of finding it, someone returning it or finding another so we can move forward with our plans."
Anyone with information about the phone booth is urged to reach out to H.A.L.T.