I found it though. Very rural, quite large (as pet cemeteries go) - 26 acres, says their website. It is very well-cared for, and tastefully appointed. A small gazebo at center, with maybe a hundred graves spread out from there. The pine forest surrounds it on three sides. The mostly canine grave markers (there are some felines too) are arranged in rows and are mostly flush-to-the-ground memorial park style, perhaps indicative of buried cremains. There were a few monuments, of sorts - heartfelt things, small sculptures, handmade remembrances, small plaster statues of dogs with wings.
This is the same type of medallion used for the death portraits we see on humans' grave stones.
If you are a pet owner – I caught myself there – “pet owner” sounds a bit crass to describe the humans involved in this memorialization of their animals. I should instead say “If you have an animal companion”…. or are just interested in the type of person who would go to the trouble of creating a permanent memorial to an animal, consider a visit to Pine Forest Pet Cemetery the second Sunday of September. You can witness their annual “Pet Memorial Sunday" - this year, it will be held on September 11, 2016. See their link for more detail.
Pine Forest Pet Cemetery