Deer are tough to handle.
A daughter and son in law have a ranchette (Western term for anything under a section). A neighbor's cattle graze the grass under the trees on the part not in hay or around the house. Reduces fire hazard. They have electric fencing around the yard, but of course that is illegal in town and many suburban areas.

A grandson lives in a small town in central B. C., and moose not only graze on everything growing but sack out on the lawn at night.

The liquid fence sounds interesting. Fence to keep out deer (or moose) is too expensive if the area is large. Barb wire controls most cattle but little else.

Dogs are useful in one area, but the place in B. C. has that law Bobert mentioned.