Skin color change?

My dog (5-6yrs old) had three lumps removed from his skin. One here at this bald spot pictured and two on his back. When he came home, the freshly shaved spots had pink skin underneath. As weeks have gone by, the skin that was shaved has become darkly spotted. In one spot on the back, it’s become completely dark skin. No discomfort associated with any shaved region. My husband and I adopted him 5mo ago and don’t know his back ground. We believe he’s a shepherd/border collie mix? Anyways, does anyone know why this change in skin color would occur?

Does anyone know what this small pink spot is on my dog's lip? I noticed it after playing fetch in the yard. He doesn't yelp or cry when I touch it and it doesn't seem to impact eating or drinking.

Heil spez, heil... oh wait

Meirl

Oddly specific

It's kinda strange to be honest

I’m a new man

Got these because of y’all.

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Canada dry #1??