Jasin OCPD Deputy Supt Mispani Hamdan said the incident happened at 9.30pm on Thursday at Taman Maju here.
The man, who is in his late 30s and believed to be a neighbour, trespassed into the house of the 37-year-old woman before slashing the dog with a knife.
The dog suffered serious injuries to the stomach but survived.
DSP Mispani said the man also caused a commotion outside the neighbour’s house after attacking the dog.
The man has been detained and remanded after a police report was lodged. The case is being probed under the Penal Code for trespass and for committing mischief against animals.