A lady brings her dog to the vet

because it is scratching all the time.
He diagnoses an unusual skin condition and writes a prescription for ointment. She goes to the pharmacist to get the prescription filled, and as he hands the ointment over he says "The manufacturer recommends that you don't wear a hat for a few days after using this."
"Oh no," she says, "you don't understand -- it's for my Schnauzer!"
"Oh," says the pharmacist, "in that case you probably won't want to ride a bicycle for a couple of weeks"

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