Simple

district deputy gets an animal abuse call. there are some horses that look neglected. not uncommon. we easily get about 10 calls a week of this type.

Officer B goes out there. I get busy and don't hear all the traffic, but several hours later he is still out there and there are more deputies with him. Then detectives and then search and rescue.

Turns out the horse looked neglected because it had gun shot wound to the face. the owner turned up missing.

turns out the owner turned up dead, murdered.
body found on suspect's property, who also had horse owner's property.

a simple case develops into a major case.
a simple animal abuse case