I used a Scratch project that I created to do the pixel art, then took a picture ok It, uploaded to Scratch, mannualy removed the background, and then converted to vector. To take this pixel art to you, select the sprite dog, tehn select costumes, then on costume dog click on the bottom of your screen, where is written backpack. Click this and then drag the costume to your backpack. When you want to use this somewhere, just open your backpack and drag the costume out to the costume sections.
Pixel art made by me. Requested by acropretty2.