IL HB3917

Establishes legislative findings that animals are sentient beings, a precious resource for Illinois, and that protecting them from abuse is a core responsibility of the General Assembly.

Expands owner duties for companion animals to include appropriate exercise and requires enclosed structures with adequate ventilation that protect animals based on their age, species, and physical condition.

Prohibits exposing dogs or cats to life-threatening situations in extreme heat or cold based on the animal's age, health, or species, and allows law enforcement to take temporary custody and seek emergency veterinary care.

Establishes specific requirements for lawfully tethering dogs outdoors, including minimum 10-foot lead length, properly fitting harness or collar, and prohibition on tow chains or log chains.

Creates new offense of "unlawful theriocide" (killing a companion animal) as a Class 3 felony (Class 2 for repeat offenses), with mandatory psychological or psychiatric evaluation for all convicted persons and mandatory treatment for juveniles and animal hoarders.