An employee of a construction company hired by us (homeowners) entered our fenced property unexpectedly, unannounced and uninvited and was bitten by our 15 pound dog. The fence had a clearly posted, large Beware of Dog sign. The man suffered an open wound from the bite. In the ensuing days, he made contact numerous times stating hardship from medical expenses, visits to an urgent care facility and pain. Over time, it became clear he had not been to a medical clinic as claimed and has now filed suit against us. Can we counter sue for false statements or something of the sort ? Trespassing? Can we sue the company he works for?