No, you cannot do any of those things. First, in regards to strays as well as animals owned by others, it would almost certainly violate animal cruelty laws: that is, you could br fined and even face jail time. Second, if you harmed, killed, removed (so that it ended up not returning), etc. someone's pet, expect to be sued by them, potentially for a great deal of money: your actions would at a minimum be the equivalent of vandalzing or destroying another's property, and could be construed as an intentional infliction of emotional harm on the owners.Finally, not that it would be legal on the owner's parts, but it is likely enough to warn against: kill or injure or dispose of someoe's beloved pet, and you should not be surprised if you home, vehicle, etc. is vandalized.Do not do this.