Thought I’d write here since I found this thread when one of our cats nibbled our sweet pea seedlings (also odoratus), in case it helps the next nervous wreck.
It’s now been a week and he seems fine, thankfully.
It happened overnight so we had no idea if it was 5 minutes previously or several hours. It was probably upwards of 6 leaves - we had before and after pictures and that’s how many were missing.
We were really worried because of a lot of web sites saying it’s pretty toxic. But we thankfully never saw any symptoms - no tiredness, vomiting etc.
We called the emergency vet (happened on a weekend) who said they could not find anything in their references about it being toxic. They said they could call some hotline to check but this would cost over £100. We declined.
We also talked to FirstVet (included in our insurance) who said that we could bring him in but all the vet could do is induce vomiting and give him activated charcoal to maybe get some out of the system if it was digested quite recently. Other than that they could just mitigate symptoms.
She also said we could give activated charcoal ourselves, though googling this afterwards suggested it could be very dangerous if not done right.
After a lot of anxious discussion we decided to wait and see if there were any symptoms, since he gets very stressed about the vet, and (much less importantly) it would cost a ton. If we knew he’d just ingested it we would have done so they could induce vomiting etc.