Do people with bipolar disorder see hallucinations?

Yes, they can be and they can also be delusional.
I hope this helps.

Psychotic symptoms in bipolar disorder - delusions and hallucinations. Delusions (fixed, false, irrational or illogical beliefs) and hallucinations (hearing, seeing, or sensing things without there being a stimulus to cause them) can sometimes occur when someone is experiencing an acute manic episode.
so sometimes in other words

Your dog can sniff at or even eat a bit of catnip. the herb is edible and not harmful. just don't expect them to roll around like a cat would! your dog may scrutinize catnip by licking and smelling at it, or be totally indifferent to this stimulant.