I am not a fan of creative grooming or dyeing so I will just not comment on that....However, I did note the picture of your dog jumping off the bench from a pretty decent height. You mentioned he is only a year old. Hopefully, you don't let him do things like that often because at only a year, his growth plates are not closed and letting him do things like jump and land from that height can be damaging to his joints. We don't let our large agility dogs (Standards in my case, but dogs of any bigger breeds) jump full height (which for Standards is either 20 or 24") depending on their wither height at 2 when they get a final measurement - dogs measuring 18" to 22" jump 20" and dogs over 22" jump 24") or do other strenuous or repetitive training until they are 18 months or so and the plates are closed. I'd hate to see you do anything now to jeopardize the future health and soundness of your boy.....