Well a bit more disturbing.......
Not all of the meat paste goes to making pet food. Some goes to making livestock feed.
I feed Farmer's Dog. No joking. I did see a change in my dog's coat, energy, behavior, even skin health. The daily dog nuggets are very small with very little smell with a regular consistency. So the nuggets are easy to collect for proper disposal. Bad kibble dog breath is gone. Kinda ironic, the cost is more than the kibble I was feeding, but after I did the math comparison, the difference was less than $20/month.
Something to think about. Large, odiferous dog nuggets are a sign of undigested fillers and chemicals.
A dog's digestive tract is short and evolved to process meats. To compare, a cow's digestive tract is long and complex allowing the fermentation of the food to capture the nutrients. Need additional evidence? Look at the tooth structure. Dog teeth are sharp/pointed designed to shred and tear meat. Herbivore teeth are broad/flat to crush and grind. More? Jaw movement. Dogs are not able to move their jaw sideways only vertical, good for shredding and tearing. Herbivore jaws can move sideways, good for grinding and crushing.
The proof is in the anatomy of the animal.
FWIW, I have yet to meet a well trained or socialized Chihuahua. I put the blame on the owner for the lack of training and socializing. Its not the dog's fault.