We don't recommend sending lilies to anyone who owns a cat because lily pollen is highly toxic for cats. There's always a danger that cats will brush up against the pollen and lick it off their fur, which could cause a serious reaction.
Azaleas and amaryllis are also highly toxic to cats and dogs so we wouldn't recommend ordering these for a friend with pets in the household.
Safest bet is to try keep all flowers away from pets just in case they have an allergic reaction!
Please see our blog post for more info: https://bit.ly/2CsI0ri