Its not a threat little missy.
It is an open promise to all of the loud mouthed key-board tough guy dog shooters out there. If you are part of this crowd consider yourself on notice.
If not go back to your knitting and sandwich making.
Communicating interstate threats is a Federal crime and it carries a potential penalty of five years in prison for each incidence.
You should probably be aware of this.
As for what you’re upset about all I can imagine is that you’ve never lived in the country and you don’t know much about cattle ranching. Speaking for myself, I’ve never broken any state laws on this topic and it may turn out that what happened in Maryland was also in line with state law. The dog was found on the owner’s property but that does not mean the dog was shot on that property.
If a crime was committed I’m sure the local police will get to the bottom of it.
In the meantime, you may wish to check your own state laws with regards to what other people are permitted to do when a strange dog shows up on their property. If you don’t like those laws then write to your legislators and ask to change those laws.
Have a nice day, FRiend.