We have a drive, at the top of the drive there is a gate onto our yard. Through the yard there is another gate which goes to the fields and at the end of that track there is a gate onto a nice quite road - leads to some nice hacking areas.
The entire of our property is private so no public access/right of way...
Recently I've noticed (since I'm at home a lot more) that several cyclists and walkers are using our drive/track as a cut through to avoid a busy junction and cycling/walking on a busy road (the same reason that we put the gate at the end of the track). I've tried putting up 'Private, No access' signs and locking the gates but I'm finding that the ones who feel it is their right to trespass are climbing the gates 
I've also been told to go fuck my self when I've pointed out that they aren't meant to be on our property. My main problem at the moment is that we will be dog sitting my Uncles 2 outdoor GSD mixes for a month starting next week. These dogs will be living on the yard (they live on my uncles yard normally but the lady who's looking after his horses is scared of the dogs - They are big, very vocal if they spot someone who isn't meant to be there and have no problem launching themselves at the gates my ideal yard dog - If they know you they're fine). These entitled cyclists/walkers who use our yard/track as a cut through are going to be met with three locked gates/signs saying 'private property' and two big powerful dogs. I also have CCTV.
I think I've done everything I can to prevent them entering but I'm concerned that since they are entitled nob-heads they will continue to use our track and then claim some sort of injury as a result of the dogs. Is there anything else I should be doing? - Refuse to use beware of the dog signs as that is admitting some form of liability.
... It's more of an essay than I thought 