Sharon - you might try (rent or borrow) a camera/lens combination that has "animal eye auto focus" capability... The first camera that I know of that had this capability was the Sony A6400. Later the A6600 was also capable of Animal Eye AF and then the A7iii firmware update included this capability.
Lately, Animal Eye AF has not been restricted to those cameras, all recent Sony mirrorless cameras also have that capability even the entry A6100, and I think we find Animal Eye AF in some Canon, Fuji and Nikon mirrorless offerings...
I first began using mirrorless cameras (Sony) to take advantage of their Human Eye AF (before Animal Eye AF was even thought of). The when Sony introduced the A6400 which has Animal Eye AF, I tried it and it and found that is great for both posed portraits and action shots of animals. Catching a dog's eye or eyes in focus is difficult with most AF systems because they tend to focus on what is closest to the lens - than tends to be the dogs nose.
The great thing about Animal Eye AF is that you can devote your energy to good composition and not have to worry about focus. The more lively the dog, IMO the more valuable is the Animal Eye AF...
I shot this using a Sony A6400 with the Sony 70-200mm f/4 lens at 74mm (110mm equivalent) with an f/5.6 aperture.
However, my favorite camera/lens combination for dog photos (both portrait and action) is a Sony APSC body (with Animal Eye AF) and the Tamron 28-75mm f/2.8 lens...
Sure you can get well focused images without Animal Eye AF (photographers have done this for many-many years) however, it is a lot easier to capture dog and cat images using this capability...
There is some danger in trying a camera with Animal Eye AF - you just might fall in love with it