how high would you say a mastff /bitch should be and what would you say the record is

Those I have met have been between 25" to 30" some even smaller, I don't think there is a breed standard. As to how tall the record is I've know idea, but would expect it to have been a while ago, as breeders these days try to keep excess size down as it can lead to health problems but it is possible that the odd very tall individual may still be born but would be unlikly to be bred from. Well one would hope not anyway. Ja:)kie