Thought I would update this. I was looking for this yesterday and I asked the Pharmacist. It is supposed to be on the shelf, where I was, Shoppers Drugmart, but she said there is a widespread shipping problem and I won't find it anywhere. This is in Ontario. She also said she did not have an alternative, that I would have to get a Rx for something else.
OP, did you find something to help your pup?