Do animals ever trip?
Animals can indeed "trip" as well, although the context and interpretation of this are naturally different than with humans. In nature, there are countless examples of animals that deliberately seek out and consume psychoactive substances. For instance, there are reindeer that eat fly agaric mushrooms (Amanita muscaria), cats that react to catnip (Nepeta), and dolphins that use potentially intoxicating substances from pufferfish for a kind of high. This behavior is well-documented and is viewed by biologists and behavioral researchers as a form of altered consciousness.
Psychedelics such as psilocin (from magic mushrooms and truffles) can influence the brain via serotonin receptors. Since animals also have a serotonin system, they could theoretically experience similar effects — but the experience itself naturally remains a mystery, because animals cannot share it verbally.
There is much astonishment about the effects of psilocybin in a general sense, both in humans and hypothetically in other living beings. Some people even reflect on the almost "animalistic" connection or instinctive feelings that emerge during a trip, showing that psychedelics also appeal to our animal brain.
In short: yes, animals can certainly experience the effects of psychedelics, and some even seem to seek them out. But where humans consciously choose inner growth or therapy, for animals it likely remains more of a natural or playful interaction with their environment.