All commercially grown orchids are regularly sprayed with an array of toxic chemicals, especially fungicides. Many of these compounds are too dangerous for the home gardener to use. Even the flowers are sprayed. Many of these chemicals are systemic, meaning they go into the plant tissues. Any seller who tells you they have un-sprayed orchids, is either unaware, or lying to sell a plant.
While you could try to wash these spray residues off, quite a few orchids groups are sensitive to soaps. Washing them could result in foliage and flower damage.
Some orchids are quite toxic on their own. Most data is about farm animal poisoning, but one should take it as cautionary for any animal consuming them.
Orchids are also unsuitable because their new leaves and young flower spikes are soft and easily damaged by animal claws.
So for these reasons, I do not recommend orchids inside any animal enclosures.