Just wondered if any of you have any knowledge about health impact of something called Vitax which is a plant food. I used it for the first time today and both dogs went crazy to get at the box which was weird, but then they can be sometimes

I dug it in to a small bed and Ben was trying to eat it, so I put him in the house, and he didn't get any. I have just gone out to see Harry digging the soil looking for some. It is really tiny pellets and well mixed into the soil now, so he would not have been able to find much if any. But I wondered if he did find some would it harm him. I have looked at their website which is quite vague
I won't use it agin, just in case but wondered if anyone has had similar problems and if it is eaten would it do any harm?