Ideas on why my dog is losing hair

Hi vets! I have a 2 year old intact Akita/alaskan malamute who is normally a very fluffy boy but as of around August started having his hair thin out, which at first looked like normal shedding (as you may know these kinds of dogs never stop losing hair😅) but now it’s very clear it’s not normal shedding and he’s gotten a lot more spots than are thinning to the point of almost bald. I’m going to take him to the vet just waiting for an appointment but I have to bring him to my parents house who have 3 dogs themselves so I’m just seeing if any vets could give me an idea on what’s possibly going on so I know if he’s possibly contagious to my parents dogs or not. Thank you in advance.