Maxi has on his both his back legs lost his undercoat, just a patch like my palm in length and on his lip he has like this:
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on the legs i think it's because i brush him to much on the same spot, can that be it? it's not visible on the legs to make a picture, it's just when you look between his hairs that you realize it and his not so fluffy there like all there rest coat.

should i be worried and call the vet?

is he still a puppy and losing his puppy coat? is he just blowing his coat? or it could be a skin issue. cant really tell in the pictures, sorry

He is 8 months now, he is not blowing his coat i'm pretty sure of that .
His skin is nice and pink i don't see anything.
I just saw it last night so i will let him a few days before I call the vet to come see him.

He's just blowing his puppy coat..it will come back in.

Mine's doing the same thing at approx. 1 yr

I think he is loosing puppy coat. koda is doing it too.. There is hair everywhere.. Its been like 2montha now since he startes.. And he atill isnt done yet..

I'd give the vet a quick call - Stark's losing his puppy coat now and it's coming out EVERYWHERE and not just in localized areas like the pics you have... That same thing happened to Stark around 6 months and it turns out it was Demodex so we had to get medications etc... Not trying to scare you or anything, but just letting you know...

Keep us posted!