dog help

hey guys, i have a rottweiler x malamute and recently have realised that on the tip of his tail, that the hairs are significantly shorter than the rest of his tail and his blonde line of long tail hair stops about 8cm from the tip of his tail and it looks like a black stub, if you guys need a photo ill supply one, thanks for any help given.

Is it a male? Just wondering, if it's hit outside it could be something with the heat

hes a male but i live in australia, its cold here now. he lives outside

also its his first winter, he's only a year old

You shouldn't leave him outside the first year he's still very young and it may be the reason why

no, ive had him for almost a year and he's a big dog, i think ill just take him for a vet since this is a very recent thing