Here are several Rin Tin Tin comic books, circa 1950-1954, Dell.
You can read them online or download to your computer----all content on Internet Archive is public domain.
Download instructions are on the left column.
I found that for me, PDF format is the best for download/navigation---I think it is the easiest to adjust to my eye focus range and the easiest to navigate pages on.
Leave me some comments and tell me what you all think----there are a LOT of Rin Tin Tin---Lassie---and others available. If you guys like them, I'll put up more links later on as I come across them.