Can cats have allergic reactions to flowers?

My has eaten a flower from my garden and I'm not sure whether its safe or do i have to take him to vet!

Hello and thankyou for this interesting question.  On the face of it, it's rather straightforward but unfortunately, like all the best questions, the answer is 'it depends.'    You raised the question of allergy.  Allergy is when a foreign molecule - frequently a protein - enters the body and the body reponds as though it has been attacked by a bacteria or virus and launches a response, frequently similar to that seen during a cold.  Such responses can become excessively violent until they are causing pain or stress to the individual ("allergy").   Now creatures can mount allergies to any protein and I can't promise that your cat won't launch an immune response to the particular species of the particular flower that they have just eaten.  Gasterointestinal expressions of allergy are less common although frequently blamed for diarrhoea. I would be more concerned about toxicity, because some plants are actively poisenous eg lilies are to cats' kidneys.  I do not know what part of what flowering plant your cat has consumed but your vet ought to be able to look it up for you.  Occasionally, a perfectly benign plant has ben sprayed by something noxious, or has come into contact with eg body fluid containing a pathogen. That said, most of the time most residues from many plants can pass through a cat without causing damage.  Your vet will be able to talk about toxic plants with you.

Hello and thankyou for this interesting question.  Like all the best questions, the answer is 'it depends.'    You raised the question of allergy.  Allergy is when a foreign molecule - frequently a protein - enters the body and the body reponds as though it has been attacked by a bacteria or virus.  The response is frequently similar to that seen during a cold but can become excessively violent with rapid swelling.  Animals can mount allergies to any protein and I can't promise that your cat won't launch an immune response to the particular species of the particular flower that they have just eaten.  Allergy is probably less frequent a cause of diarrhoea than times it is blamed for it.  I would be more concerned about toxicity, because some plants are actively poisenous eg lilies are to cats' kidneys.  I do not know what part of what flowering plant your cat has consumed but your vet ought to be able to look it up for you and there is an emergency veterinary poisons information service online.  Occasionally, a perfectly benign plant has been sprayed by something noxious, or has come into contact with eg body fluid containing a pathogen so this is another concern.  Most of the time most residues from many plants can pass through a cat without causing damage but it does pay to be careful.