Are 'pet friendly' workplaces a good idea?

I've noticed pet friendly policies becoming more and more common in offices in the US & Canada and am undecided as to whether this is a good idea.

Its obviously great for the pet owners and I think employers should make efforts to create a nice working environment for their employees, but it is a place of business at the end of the day. Also not everybody likes dogs & cats, not to mention allergies.
No, service animals only.
Vote A
Yes, dogs only.
Vote B
Yes, dogs and cats only
Vote C
Yes, all pets (at management discretion)
Vote D
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Are 'pet friendly' workplaces a good idea?
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