SCM is right there are 2 different ones. The ones you buy at the vet are very expensive and they are the right ones. I buy mine online from the US and have them shipped via the mailman. Its great. I can forward you the location that I get them from. I understand the issue with them not being allowed in Canada is because they are like your Glade Plugins and the Diffuser / Plug in is not CSA approved.
The ones at the pet stores are not the same for some reason.
Oh and the reason I am using it is because mt little princess kitty Tabitha likes to pee on the dogs bed and only is bed! Now she doesnt do it anymore  so it works for me. I know many it has worked for and a few on here have said it didnt work so I guess you wont knoe till you try it. The concept makes sense to me now but I had never heard of them before..
Good Luck
__________________
Tabitha April 10, 1995 - August 23, 2013
Bomber April 10, 1995 - July 12, 2010
Winston Nov 15, 1999 - September 15, 2011
Sophie Aug 30, 2011
"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion.
-Unknown
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