TallyBurd

I draw closed snoots pretty much the same way as opened ones, as illustrated in this one tutorial i did a bit ago! Same goes for drawing opened mouths from the front. 

for closed muzzles, I tend to do placement lines for where the base of the muzzle connects to the face (and also as a marker for where the bottom of the eyes are gonna go!) and a line down the center of the muzzle to help me place the nose and make the upper lip indent shape! This is something I honestly don’t do too much bc I mostly forget but it helps SO MUCH

end result from using said guidelines hfhfh

as for opened snoots, here’s a lil thing using the same formula as my first tutorial;

Firstly, I start out roughing out where I want everything to go! The purple line in the right image helps me place the top corners of the mouth, where i’ll be dragging the lines for the sides of the mouth in a sec. This is a good time to map out how you want your expression to go, since the corner of the mouth I find makes it easier to connect everything else as you’re going along. 

After you get that sorted, drag the lines (blue lines) down from the corners (it’s perfectly fine if the lines don’t match up with the corners, it doesn’t have to be exact!), which are the rest of the mouth. Now is a good time to go in and tighten up/stretch the mouth shape to however it’ll benefit your character/style/expression. My sona has pretty round shapes, so I keep things rounded for her most of the time. (unless i’m exaggerating her expression, then things tend to get a little bit sharp and asymmetrical)

Annnnnnnd then you go in and start adding details! Teeth, tongue, etc. You can see I kinda shortened the lower jaw shape lines a bit after everything since I noticed the mouth was a bit too wide/sliding to the right.. Just so it aligns with the top part of the jaw a little easier!! this is pretty much how I do all my mouth/muzzle stuff, so I hope it helps a bit!