This angle can work, but go portrait, and watch out for cropping the tail and his feet. . .but I agree with Rick 110%.
I caught that when I was putting my signature on it, and now it bothers me every time I look at it :/
Good deal--self-awareness!!!! Anyway...a tip is if the subject is posed in such a manner that he/she/it is
taller than it is wide, a TALL camera orientation is usually the most-appropriate. So, for example, on a dog that is facing the camera, and standing, or sitting on its hind legs, a "tall" camera orientation will most typically match the pose better than a "wide" orientation will. This is a compositional basic that many newcomers fail to understand. Or debate and contest feebly.
If a subject is posed so that it happens to be wider than it is tall, a wide-orientation on the framing will usually be most appropriate; a dog that happens to be posed sideways to the camera, such as when the dog is in the field an on-point on game birds, or when the dog is lying down beside a fireplace or wood stove--well...you know...a "wide" camera orientation will usually be most-pleasing.
This is not an immutable rule, but it is a guideline that applies somewhere between 90 and 95% of the time, I would say. The sooner you study and
understand the "why" behind this concept, the sooner your work will begin to look like you're serious about photography.