The answer depends on the details. It depends on why the horse is on someone else's property, whether there was a boarding agreement or whether the horse simply broke free from your property. If your horse is trespassing it must be removed immediately. If there was some reason why your horse was legally on another's property then you need to review that agreement.
Human - no person should ever be thought of being someones personal property. Slavery was abolished long ago in the US.
Depends how long it has been there.
The symmetric property of equality walked into a bar with a horse and the bartender asked, "Why the long face?"
Your property needs to be removed prior to the sale. Once the property has been sold you have no right to enter.
have it towed away. as long as you have the private property owners permission.
As long as the viewing area of the camera is limited to your own property only.
Yes, as long as it isn't stolen mail. No, it is illegal, even to place a flyer on the flag. The mailbox is US Government property.
You cannot remove a horse from the safe haven on Howrse. Once the horse has been put in there it cannot be retrieved. You can revive a horse that was put into 'Heaven' so long as it is under 25 years old and you use a Pandora's box.
it varies from state to state - in some states, if you find something of value above $100 you are required to surrender it to law enforcement.
sometimes it may be the tip of someones pencil!
Yes, as long as it does not constitute a breach of peace, such as attempting to remove a vehicle from a locked or unlocked garage. Unless the property is legally posted.
yes, even if the golf course is publicly owned, it is NOT considered a park and you must have permission to be on it. If it is a private course, it is private property and you would be trespassing.