I've used printable fabric sheets on several projects, but don't have any information about frequent washing. I like the ones from EQ best. You put it in your color printer and then print the picture just as if you were printing them on paper. You can insert your picture in Word, or Powerpoint, or any computer program that you are comfortable with. Then you can also put a caption or the pet's name on the picture as well. Good luck. With these printable fabric sheets you do not use your own fabric. I've never done that before.
I've got a posting in the "pictures" forum of a quilt that is entitled "Memorial quilt for Tyler" where I printed many pictures. PM me if you want additional information.