If a cat eats peyote, you know how he can trip out and imagine he is
somewhere he's not? like a person could eat peyote and think he is
climbing some high mountain when really he is sitting on the couch in
his living room. Well, the point of my question is 'If the cat has
never left his house then what will he think when he is trippin' out?
where will he imagine he is if he's never left the comfort of his
home?

I don't think anyone has any notion of what animals' hallicinations
consist of. Investigation into animals' normal dreams is highly
speculative; how could anyone know what is going through a cat's mind
when the creature is under the influence of a powerful psychoactive
drug?

Cats become very disoriented and unhappy when in an altered state. My
best guess is that a cat who has been given peyote is much more likely
to be thinking "HELP! SOMETHING IS TERRIBLY WRONG!" rather than "Oh,
wow, what a trip!"

Loreno --

Animals don't always react the same way to drugs that humans do. 
Opiates, for example, are depressants to the central nervous system in
humans but often are stimulants to cats.  Here's an excellent
resource:
Illicit Drug Intoxications of Small Animals," (Robert H. Poppenga, 2001)
http://www.vin.com/VINDBPub/SearchPB/Proceedings/PR05000/PR00397.htm

Best regards,

Omnivorous-GA