It is just the T7. I have used the camera from a similar distance we would be in for trials and the pictures seemed grainy when I had to zoom in all the way to view the handler and dog. Again, it could be the settings my camera is set to? My lens does need to be cleaned I am just nervous at doing it myself. Maybe that plays a roll in the grainy-ness? I am also trying to figure out shooting pictures that go from the light and into the shade as there are many trees surrounding the field.
"the pictures seemed grainy when I had to zoom in all the way to view the handler and dog"
This is confusing.
Are you saying it looks grainy when you zoom the lens in on the camera, OR when you zoom in on the picture in your computer?
If you are zooming the lens, the "graininess" should not change.
If you are zooming in on your computer, then it makes sense that you are seeing grain, actually noise. The more you zoom in on the picture in the computer, the more you will see image noise and the quality of the image will degrade.
The idea is to zoom in as close as you can with the lens, and do minimal zooming in edit on the computer.
The reality is, when I am shooting sports, I do not zoom tight. If I do, it it is harder for me to follow fast moving action, and keep it in the viewfinder. So when I shoot sports, I leave space around the subject, more so when I have a subject that can change directions on me.
"
I am also trying to figure out shooting pictures that go from the light and into the shade as there are many trees surrounding the field."
Welcome to lighting problems in sports.
Subject going from sunlight to shade can be/is a pain to deal with. Some/many cameras cannot cope with that.
If it is a sunny day, and the dog runs into the thin shade of one tree (like your #2), most of the scene is full sun, and the camera will expose for full sun, and underexpose the dog in the shade. While evaluative meter mode claims it can handle back-lighting, in my experience, it does not reliably do that.
The only way that I know of, to deal with that, is to use the camera in SPOT meter mode. BUT, then YOU have to hold the center autofocus point on the subject, as that is where the spot meter is. This places a premium on your tracking skills.
But there is no free lunch. I lightened your picture so that the dog was more correctly exposed, to simulate a spot meter on the dog (or the handler). But notice how bright the background is, where the grass is in full sunlight.
To avoid this bright background, you would have to study and plan where to shoot and where to not shoot.
Maybe you have to limit yourself to shooting the dogs when they are in the sunlight.