Replace Male Avatar Get Thumb with our avatar

Hello

Where do we go to replace the male avatar: http://uploadyourdog.com/modules/?r=photos/get_image/thumb/0eafaff7ea435e51526453d23c31300b.jpg

Every female that signs up on the site automatically is assigned a male avatar and we would like replace with a female dog avatar.

Please advise. Thanks.

there are 3 I think - in the template/base/images/icons - i believe thats the ones there

 Hello

That specific image is not in the template/base/images/icons folder.