Are there any harmful things added to pet foods by the interlopers?

The interlopers only do what they do with human food to some extent, and that is to encourage adulteration with chemicals in the processing, preservation, appearance, and flavor through using substances that may be harmful, and that simply carries over universally throughout food manufacturers and suppliers, including most pet foods. So these are low-level threats. Most pet species are too short-lived to encounter difficulty from such substances, and that is because of a genetic species-specific lifespan, not a dietary outcome. The interlopers do not care about companion animals because they are too insignificant to bother with from their perspective. Not being able to understand love to begin with, they do not even fully appreciate how important companion animals are to their owners much beyond representing possessions that are chosen, but in the minds of the extraterrestrials more like decorations and idle amusements because they are living things. To them, a human on a walk with a beloved canine is exhibiting their power and control over the hapless animal. There are many more effective ways, in their thinking, to harm human beings than arranging mischief for their pets.