Be handy to know how much its seen and how old it is, if it's a first season terrier that's seen only a few it might mature, if it's into it 2nd season and seen a good few there's not a lot you can do its just not doing enough to put them in the block end if it's moving out of the block end when your going down, then it's up to you if you can put up with that, personally I couldnt