Help! Japanese skimmia losing leaves

I have a japanese skimmia near the front door which up until a few days ago was thriving. Now it's dying - all the leaves are turning yellow and falling off. I saw a rabbit in my yard the other day and was wondering if it or a neighbour's pet sprayed it? I just cannot figure out what has caused this plant to react this way in such a short time?

 

Might need more water. Be kind to it, it should come back.

 

Thanks for your opinion. I moved it to a more well drained area. When I moved it I saw that it was actually too wet and the soil was clumped up around the roots. Hopefully it will recover...