My dog's eaten this and is ill, what is it?

My dog's eaten this and is ill, what is it?

Observation - My dog's eaten this and is ill, what is it? - UK and Ireland. Description: Heart shaped, veined leaves and black berries We have a dog that has eaten this plant and is now at the vets. Can anyone help us identify it so that we know if it is causing his illness?

Heart shaped, veined leaves and black berries
We have a dog that has eaten this plant and is now at the vets. Can anyone help us identify it so that we know if it is causing his illness?