I couldn't have said it better myself, You described exactly what I meant, but we also have to consider the detail of the character's hair.
Eh, I don't think that's a problem, Ranzo from Dawntide (awesome and marvelous vn, almost everyone should check it out) has the same type of hair, I even think David and Ranzo are the same breed (Schnauzer)
Here's an image of the dawg in question:
Idk how, when, where, and why, but, Ranzo shares some points in the "why does a furry look old?" thing we got here, and somehow to me, seems like a 20-30 year old
I would say the color in the snout is the one making us think he's old, but, yeah, his hair just grows like that, he could just go to a barbers shop and everything would be done, David just doesn't do it because (reason goes here)
Even so, I feel like in a furry world type of setting, it would make a good plot point, like, maybe it would be a little silly issue the character has to bear or, a deeper insecurity eating the character little by little..
Idk, I think I should just make a vn by this point, I have a lot of ideas and it sounds fun, anyways, see ya, thx for reading and have a good day (or night), stay safe out there :D