When a woman took an unresponsive pet mouse to an overdose prevention site in Canada over the weekend, a clinic worker jumped into action.

The woman told staff that the mouse had eaten heroin. Clinic volunteer Melissa Patton gave the mouse, Snuggles, an oral dose of Narcan, according to the CBC. The drug is widely used to reverse the effects of an opiate overdose. Patton also gave the tiny rodent oxygen.

Snuggles responded well to treatment. Patton has adopted the mouse after the owner said she was going into a treatment center.