thank you for your words of help and support.
I guess you think yes he's from the rescue so what did you expect...and he has been fine since but we will always have the doubt...we keep a constant vigual on him as he is a silent dog.
And on ...

We are at our wits end.
I thought I would re-post my help plee here as the post seem to get answered...
Our 3 +half yr English Mastif Cross has snapped out at my 27yr old daughter and has cut the top skin . This attack was totally unprovok...

Well I thought I'd pop by to see if anyone could help...???
Anyway I can update you our boy is still with us and my daughter does not come round so often...

We are at our wits end. Our 2yr English Mastif Cross has snapped out at my 27yr old daughter and has cut the top skin layer 2cm away from her eye, to which she has had 5 stitches. This attack was totally unprovoked, my daughter was strocking him go...