Thanks for the inquiries, and support. Koda is 20 months old. BTW, we live in Green Bay, WI. I've posted some pictures here: http://kodabear.pbworks.com
My initial thought was that he was trying to get some rabbits under the deck, and got scraped up by the chick wire that we have along the bottom of the deck, but there was really no evidence of him digging, or trying to do that. I considered spider-bite, but since I've noticed these bumps/blisters on the outer edges of his ears as well, that really doesn't explain that.
I thought about allergy to a soap or something he ate. He did go to the groomers about 2 - 3 weeks ago, and did have some different dog food about 1 1/2 weeks ago (we ran out of dog food, so I used some of my neighbors for 1 day.) But I would think if he had an allergic reaction to either of those things, it would have come about closer to the individual events.
He is eating/drinking just fine. Doesn't seem different mood-wise. Urinating & pooping fine. Again, my fear is that his symptoms seem very much like what is described here: Canine Pemphigus: Blisters and Skin Lesions in Dogs
If this is the case, I'm also fearful of the costs involved in diagnosis/treatment. I'm beginning to wonder if I should invest in pet insurance, and wondering if a company would even consider us if this is a pre-existing condition.
So many questions . . . but I'm grateful I found this forum for support. Not sure where else to turn. Thank you.