In WWII the Norwegians would lace blood-stained handkerchiefs with cocaine in order to desensitize the nostrils of dogs. Apparently it worked. Can we please turn this into a cocaine thread now? Cheesy

Interesting, but do you have a reference for that? I'd love to see more on it --  obviously something that acts similar to cocaine in this fashion could be used, and still be legal - hopefully more volatile as well.

I remember reading something about that in a book in high school, but it was a fiction book, and I could never find a reference to see if it was real or just made up.

Yeah, good luck on that one, that was a wild goose chase for me, and still never ended up finding out anything - but it is somewhat of what made me think of this topic.

It would make sense, at least to me, that  a local anesthetic would cause a lose in smell -- I wonder what some of the more volatile local anesthetics are?

Actually that is "meat myth" is pretty cartoonish idea that doesn't work for sure!
You think those dogs aren't selected and trained for such situations!?

I witnessed their training once...

I also saw on discovery that scientists use lidocaine drops to
temporarily neutralize sense on test animals.
But I doubt it would work without putting it in form of dust of drops in
the nose of animal, and in that case your bigger problem is something under the nose!

It is funny to se how grossed dogs are by the smell of p-benzoquinone!
Damn this stuff is irritating and overpowering, but doesn't smell that much
so dog handler would not be alarmed.
(Cops are usually less intelligent than their dogs and don't have such big database of smells.)

It would be even funnier to witness situation when they are frantically sniffing around
and than stumble upon over fine dust of this material, if you ever worked with this stuff you got an idea 

It might be possible,but you still need to disperse this supstance.
All old tricks probably have counter measures,we search for new ones!
p-benzoquinone works equally well,maybe better,it is much more aggressive
toward tissue and it SUBLIMATES!
My guess is that this stuff might even interfere with most of the
chemical testings done by police,being very strong oxidans that react with swabs,paper...

something like this could really come in handy when you're making methylamine 
salat

It seems like something severely irritating would cause the dogs to respond in a way that would alert their handlers that something suspicious was happening.

Also to ensure the levels are high enough at a distance far enough away from the source, the levels in the air near the source might need to be high enough to remove the sense of smell of the dog handler and whomever is handling the product (ie. you and your acquaintances.)

It would ideally be something temporary, then.

maybe sublimated piperine? i vaped a few mg on foil and allmost gassed myself out of the room! i couldnt smell for about an hour! same thin with a few ml of thionyl chloride that got loose.... thought i gave myself pulminary edema with that one though. couldnt smell for about a day and a half.

its probilly because thionyl chloride is a powerful lachrymatory agent that totally fucks up your respiratory system like all the others i listed and pretty much any xxxyl halogen because their decomposition products when exposed to atmospheric moisture are usually strong acids in gaseous form. rapid inflammation of tissues along with mucus production and tearing usually result from even a small exposure. and the fact that since you (or the dog) would be inhaling these strong acids tissue damage does occur possibly causing the temporary loss of smell, sight and breathing difficulties. permanent damage can occur (Pulmonary edema, embolism, extream prolonged respiratory distress, tissue scarring and death) if the exposure is high enough....  approximately a 5-10% solution of thionyl chloride (or bromide phophoryl or any of the other xxxyl halogens) in chloroform or ether (an anhydrous alcohol might be a better choice because it is more hydrophilic than an ether or halocarbon) in an aerosol would be highly effective. possibly with a wireless (servo actuated) delivery system with the remote hidden on your person. when the cop gets the dog push the button to flood your car with invisible vapors of hydrogen chloride and sulfur dioxide... it only takes a few seconds of exposure and the dog wont want to remain in the vicinity of the vehicle.

Methyl benzoate imitates the smell of cocaine. I've thought of spraying it absolutely everywhere in order to make drug dogs lose it. It's about as legal and safe as chemicals get.

Very nice! Isn't it found in certain mouth washes?

that's a common trick of mexican drug traffickers.
and i'm sure border agents are well aware of it.
the guys who spray your window and wipe it down for spare change are given a c-note to put cocaine in the spray bottle so that the dogs alert on every vehicle.
then while the dogs are being replaced the real shipment goes through.