Simple keychain whistle. Seeing as if you’re living on the North Shore you’ll be living with Coywolf, I figured why not? Cheap.
The experts on the PBS “Meet The Coywolf” program suggested that if you encounter Coywolf in your yard, you ought to haze them and make them feel uncomfortable.
You can get them on Amazon for like next to nothing.
Good Morning Gloucester 
Give them a serious ear ache and scare them so that would help teach them not to approach humans and maintain the fear needed so encounters are minimized.
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Good suggestion for your key chain on many levels ~ mine is green 😉
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Great idea! We woke up to howling and screaming at 3:37am this morning by more than 2 Coywolfs in our back yard. Why do they howl and scream?
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Paul,
There are many reasons mostly communcation just like us humans more here and qouted to the direct area I use this site allot along with personal experiences:
Vocalization
“The coyote is one of the few wild animals whose vocalizations are commonly heard. At night coyotes both howl (a high quavering cry) and emit a series of short, high-pitched yips. Howls are used to keep in touch with other coyotes in the area. Sometimes, when it is first heard, the listener may experience a tingling fear of primitive danger, but to the seasoned outdoorsman, the howl of the coyote is truly a song of the west.
•Howling – communication with others in the area. Also, an announcement that “I am here and this is my area. Other males are invited to stay away but females are welcome to follow the sound of my voice. Please answer and let me know where you are so we don’t have any unwanted conflicts.”
•Yelping – a celebration or criticism within a small group of coyotes. Often heard during play among pups or young animals.
•Bark – The scientific name for coyotes means “Barking dog,” Canis latrans. The bark is thought to be a threat display when a coyote is protecting a den or a kill.
•Huffing – is usually used for calling pups without making a great deal of noise.”
http://www.desertusa.com/animals/coyote.html
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