Dane County Humane Society said Wednesday morning there had been a break-in at the shelter at 5132 Voges Road.
Gayle Viney, public relations coordinator for DCHS, said the animals are safe and unharmed after a front window had been shattered and a donation box was carried outside and smashed sometime overnight Tuesday. No other damage or theft is suspected, Viney said.
Police said they responded to the intrusion alarm at the Humane Society around 12:52 a.m.
The organization said it has a security system that helped prevent any further loss.
"It's unfortunate that someone would want to steal from a humane society, especially when so many of our cash donations are from children's fundraisers," Viney said.
The donation bins and cash registers are emptied routinely, minimizing the loss to DCHS, she added.
It was not clear Wednesday morning how much money had been taken.