Can anyone tell me whether the small yellow plums are dangerous to cav's. We have an 11 week old called Harvey and my next door neighbours big plum tree's branches hang over our fence. When the plums drop they fall into our garden which up till now was fine as the children love them. They are the small yellow kind but are these ok with the dog as he keeps picking them up and running round with it in his mouth. Reason I ask is that he was sick last night and dont whether it's du to that?