After determining the thumbnail, I import the thumbnail into tvp and adjusted the timing to determine the approximate movement.In this step, I add the general movement of the mouth according to the timing.

The next step is further work on keyframe.I find it difficult here, because I choose animal to do the lipsync exercise,and I don't know what to do when I start to progressing the keyframes.
After asking Christina for advice, I roughly understand the steps of painting, first draw the movement of the animal's head, and use the nose as a reference point to ensure that there is no excessive deformation. Then add the movement of the mouth.

About the movement of animal mouths, I have watched a lot of video materials including real images and animations.

First is to understand the structure of the canine mouth.
Second is to observe the opening and closing movement of the mouth.
Through the information I collected, I learned that the hunting method determines that it takes a long time for the dog's nose to bite the prey continuously, and the bite force is related to the size of the skull and the degree of opening and closing of the mouth, so the dog's nose is very prominent, but the size of the occlusal angle is not as large as that of cats.
Although I did not draw the structure of the teeth and mouth in detail and accurately in the animation, I have a rough idea of ​​where they are and how they are laid out.

I further added the movement of the mouth and uploaded it on padlet for feedback from Christina. The advice Christina gave me was the mouth shape feels off is at the end of the first word "hi", I need held for a while the "e" mouth shape needs inbetweens.

I added two inbetweens to make the "e" mouth longer.