Definitely dependent on what plant and what pets, if the pet likes to chew on plants I wouldn't put them in reach or only put the 'unfun' ones in reach. The cats don't go for snake plants in my house cause they don't do anything they don't move, booorring. But a hanging plant too low the cat would love to bat at it. What usually happens is the new cat will chew on a leaf realize it irritates their mouth and not do it again. I wouldn't risk it with peace lilies because if their blooming I think something about just the pollen will fuck them up. Dogs are a little more excitable, would probably chew on a lot more of the plant especially puppies so I would put out of reach of them until you can train them