The blur can't be removed, but this is camera shake / movement while the the shutter is open... Can you post the EXIF data? Basically, you need a faster shutter speed and to hold the camera as still as possible.
There are two "Types" of blur when the shutter is slow.... When the subject moves, or when you move... This looks like you moved while the shutter was open as the blur is a regular amount across the frame.
Concentrate on your posture when taking photos... It sounds obvious, but hold the camera with two hands, tuck your elbows into your body and breathe steadily.
All you can do is learn from this picture, I'm afraid you can't un-blur it and save it.
Do you still have the hat? I like the idea of a colourful & cheerful hat when the dog pulls that fed up face... If you can capture it again without the blur, you will have a great picture!