I dunno... with "The Klonopin Years" being an exception, Stevie's often been credited for having a terrific sense of humor, by journalists and by her peers (Ann Wilson & Bob Welch, for example)... so I don't think she was showing a lack of humor here. And if I remember correctly, Christine wasn't too blown away by the cover either.
I have to agree with them... a goofy polaroid of a snarling dog and someone's outstretched leg, makes for a less than thrilling album cover.
But hey... it sure is quirky!
Johnny Stew