Wireless Sensor Networks (WSNs) are the collection of self - organizing sensor nodes deployed in various physical environments statically or dynamically depends upon the application. In wireless environment these sensor nodes are defenseless or vulnerable against attacks. To solve this problem the Intrusion Detection System (IDS) has been used. But this is not sufficient to achieve maximum resiliency against attacks. Considering the issues here a new Dynamic Intrusion Detection Protocol model has been designed based on data flow for low data-rate Wireless Sensor Networks (WSNs) while the network has low mobility and minimum traffic rate.