If my dog is actually doing something beside chasing hogs there is a problem. But I had my dog on a small piece of land and the dog started after a pig. There where no fences but I saw no trespassing signs. The dog was out in front of me so she was trespassing. But I stopped and called my dog off. I am glad she came back. I have no problem if I break a law then let the cops or game warden do their job and it can be settled in court. I talk to neighbors I am hunting on. The case I just said he said if the dogs chase a pig onto his property I could not go after it. He said he would shoot the pig if he saw it. But he did agree to not shoot my dogs as long as I was calling them off the pig. He stopped short of giving permission to go get the dogs but did not tell me not too. But I can respect his position. He wants to hunt his own land. I do think you should watch your GPS and keep your dogs off other people's land to do your part of protecting your dog. But when your hunting stuff happens.
I was asked for the TPWD site
http://www.tpwd.state.tx.us/landwater/land/habitats/faq/law_enforcement/hunt23.phtml