All Ears Blue is an interactive toy From Fisher Price based on Blue from Blue's Clues. It appears to have been released in 2000.
The plushie of Blue wears a white shirt with red overalls that are covered in swirls that are a lighter shade of red.
PDF version of the Manual here.
Blue can wiggle her ears up and down or move them back and forth.
She responds to being tickled by barking and wiggling her ears up and down, and having her nose kissed or pressed by barking, "I love you" and swinging her ears forward in attempt to hug your face if you are kissing her and then wiggling her ears up and down thrice while barking. She also responds when you hold her trumpet to her mouth, by playing the Blue's Clues theme song, or she will use the trumpet like a party horn.
She also responds to being fed her ice pop or juice box.
Squeeze her left paw and she will wiggle her ears up and down to the Blue's Clues theme song.
The commercial, back of the box, and an image on Mattel's website feature a prototype version of Blue with a different muzzle.