The cansee() checks are not really correct for seeing your pet move.
Changed them to a pair of canseemon() checks, one before the move, one after.
I can see an argument for canspotmon(), but decided to keep it based on sight.
If your pet is unseen in both locations, you won't get any messages, which
I think is more correct. If you do get the message, use noit_Monnam to
ensure no more "it" message.
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