I not an expert on the science behind it, so please correct me without freaking out if I get some detail wrong... but herbivore' manure may be applied directly

I not an expert on the science behind it, so please correct me without freaking out if I get some detail wrong... but herbivore' manure may be applied directly to the soil. Pet's (dogs and cats) manure must be composted first. There are 2 plausible reasons why this may be so. The first is that large farm herbivore's (cows and horses mostly) are different enough from human beings that the diseases they carry cannot cross the species barriers so easily, not so with pets. Composting kills bacteria in at least 2 ways: it heats up and all but the thermophilic bacteria get killed, and competition from sturdier aerobic non-pathogenic bacteria in the compost pile drive off the rest after a couple dozen generations. This is specially important for dogs since we have been co-evolving to eat roughly the same foodstuffs for a couple million years. But I really don't see much of the same concerns for cats. The other idea is that cat's feces are what gardeners call "hot" themselves. It has nothing to do with temperature, but with overly high nitrogen contents. I don't have a reference at hand, but the basics of compost chemistry say that nitrogen based substances react and break down cellulose in the plant derived parts of the compost pile, making the carbon in it usable by the lifeforms in the soil. This has the side effect of coupling the toxic nitro in the catalyst (urine and feces) with carbon atoms, changing it into non-toxic forms that are themselves usable by the lifeforms in the soil as well.