See I don't have a problem with people reporting to the ASPCA without further knowledge. It happened to the ranch I board my horse at. We had a lot of old horses that we were doing our best to keep weight on, but old age was just catching up to them (they were in their 30s). People saw them out grazing on the pastures and the ASPCA came out and talked to the ranch about it. The ranch just explained to them their age, they saw the care that was being put into them, and just advised that the ranch should think about putting them down before winter because it was going to be a harsh one. The ranch had already planned to put them down before the winter, but was giving them one last shot. No harm done.
And no pets do not belong in the same category as human children. If you eat any kind of meat or use any animal products then you too are using animals for your benefit. That's what they're here for our use, but we need to treat them with respect. If you want to say an animal needs to be defended as much as a human child I would expect you to be a vegan then. An animal is not equal to a human. There's no sense in comparing the two.