She's 18 weeks now and I can't believe how big she is!!! Almost the size of my 11 yr old catahoula. But I really need help...she barks that shrill puppy bark, loud as possible, over and over all day, over EVERYTHING. I've been trying to train her not to bark for months!!! She just looks at me and barks again

Help

Marnie is finally tolerating the blow dryer, and let me dremmel two of her nails today! 😊 she also kind is starting to enjoy her biweekly bath time!

This is my parents, five year-old purebred, neutered male collie, Kipling. Kipling is from a reputable breeder from North Carolina. My family has had many collies throughout my growing up years, and this was our very first collie that was purchased from a breeder. We did a lot of research on collie breeders, and this breeder was wonderful and we got to see both parents as well as his siblings (if that makes any difference). Kipling was a wonderful puppy, and he still has the classic happy-go-lucky beautiful Collie personality that we all know and love. While my parents are elderly, I help them out as much as I can with making sure their dogs get a good amount of enrichment every week and my parents have a large, beautiful backyard that Kipling and his rough collie brother Pippin enjoy romping in. Ever since Kipling turned about a year old, he has had fairly severe allergies and he also has unfortunate eye issues (not collie eye). Everything that has come up with him he has been seen by our longtime vet for, and he is being treated for those issues, and he has seen allergy specialist. The allergies have mainly affected the fur on his face, and there was a time that he went through where the fur around his eyes started to fall out, but since he is being treated for that, it is much better.
My main question is, (as I actually currently have him and his brother because I am Dog Sitting For my parents while they are out of state for a few days) This is the first time that Kipling has been in my home for a longer amount of time than just a few hours to come over and play with my own two personal dogs, and I am noticing some things that my parents have talked about before, but they have only ever said these things to me in a way that they just kind of find these things funny and quirky. I have never seen a dog have such a voracious appetite- I have had to put everything in my house cannot physically swallow. Anything that he can fit in his mouth he tries to actually ingest, not just chew on. He is not overweight as my parents monitor. I control his diet very well. I also notice that his coat, while it is not extremely bad by any means (no matting), and they are professionally groomed regularly, his coat is crazy. It reminds me
of the cats that I’ve seen every once in a while, that have hypertrichosis. I do not believe that he has this condition because I know animals that have this condition would have truly far much more hair than what he does have. I personally have never seen a rough collie with as much hair as this guy has. The collies that my family has had in the past, have all been purebred collies, and I realize that they all have a crazy amount of hair, especially when compared to many other dog breeds like labradors, bully type dogs, etc. That’s obvious. But Kipling‘s coat is so insanely dense that it’s ridiculous. I have looked up symptoms of hyperthyroidism in dogs, and I would think that after him having received regular veterinary care, including appropriate bloodwork every year, that something like hyperthyroidism would have been caught long before now. Am I grasping at straws? He again, is a very sweet and loving and wonderful dog, but to me there is something that is just a little bit off.

I love his fluffy head so much.