We have discussed this before and I just not sure I agree with Laz on this one.All snakes have cloacal scent glands.The cloacal scent glands are used to mark territory,attract mates and sometimes used in combination with feces and urates in an attempt to get away from predators.The repellent feature is supposed to be taste.I haven't had the pleasure (yet).
Does anyone think that skunk essence or that of various Mustelids tastes good to canines? Are they repelled by it then?
Some snakes utilize their musk more than others and they are often,smaller,non-venomous snakes but not always.Noted species are garter snakes,milk snakes and water snakes.The chemical components are supposed to be similar but they all smell a little different to me.Black rat snakes,back East,are a large constrictor and to my nose,have a very skunky,musk smell and use it when threatened.Copperheads have their own distinct smell.Some say they smell like cucumbers.Not to me but it is kind of acrid and really hard to describe.I have smelled it many times when I was trying to catch one,long be fore I did.Cottonmouths are in the same family but smell a little different but they too,discharge their musk when scared or agitated.
In another thread on this subject I mentioned experimenting with some pure,timber rattlesnake musk.That lip curling seen in dogs is not repulsion,nor is the rolling.What I saw,looked like a flehmen reaction,lip curling,slobbering,shaking and consequently,much foot shifting.I only had a tiny amount so I just uncapped the small jar and held it at nose height on a dog.I never gave them a chance to roll.The reactions were very dramatic.I missed one gray fox with it on a post set and the tracks in the snow,looked like the same reaction that I saw in small dogs.Snakes had been in hibernation for two months.I honestly believe there may be a pheromone in snake musk that elicits a matrix type reaction.
I truly believe this is a subject that has been way understudied but honestly,it wouldn't be very practical for a commercial lure maker,but maybe for an individual that makes his own and likes to experiment ? I do believe no coyote or other wild canine would be repelled by the smell of any snake,venomous or non.