"The majority of the great things we do here are from our donations from our supporters," Suzanne Roman, executive director of the Grand Strand Humane Society, said.
For food, equipment, and shelter, it's what Roman and the team rely on to operate efficiently. The tax bill the president signed into law on Friday could shift the number of taxpayers who apply for donation write-offs.
"It's obviously upsetting," Roman said.
The number of Americans eligible for the charity deduction are expected to drop in 2018, from 30 percent to as low as 5 percent. The tax bill has twice the standard deduction and puts a cap on the value of other deductions, like for state and local taxes.
Back at the shelter, Roman is hoping for the best.
"Many of our supporters are middle class people who just want to help," she said.
Charities could also face uncertainty even after next year. Some donors may be unaware of the pending tax code changes and continue to give money only to find out they'll be paying more in taxes in 2019.