In the US the plant called a shamrock plant is toxic which you can read about here
Most often the reaction is digestive upset.
But you should call your vet to see what they suggest doing.
Or if your vet is closed and you are really worried you can choose to see an emergency vet
or call a poison hotline
You can call the Animal Poison Center. The phone # XXXXX this service that provides nationwide immediate help is 1-800-213-6680.
There is a one time fee per case.
National Animal Poison Control Center : 1(NNN) NNN-NNNN. This 24-hour manned emergency number is XXXXX in part by 36 different companies along with a charge for consultation.
Hope this helps you!