EMDDs (including stun guns and devices known by trade name TASER®) should not be used on any animal for routine capture or restraint.
EMDD's may be used as a defensive tool to provide an Animal Control or Law Enforcement Officer with non-lethal force in response to aggressive dogs or similar sized animals in accordance with agency training, policies and procedures. EMDD's can be lethal and should not be used on cats or other small animals.
Welfare Implications of the Use of Electro-Muscular Disruptive Devices or "TASER(R) Devices" on Animals (PDF)
2015 American Veterinary Medical Association