Oregon lawmakers are being asked to regulate the tethering of dogs so they're not left chained up in dangerous situations.  A bill would make it illegal to tether a dog if there's a strangulation hazard, if the tether is less than 15-feet, if there's a choke collar and there would be time limits.  Kelly Peterson, with “Fences for Fido” says dogs that are tethered too tightly are more likely to bite.  “Fences for Fido” is a non-profit group that builds fences for dog owners who can't afford them.  They’ve built more than 550 fences in Oregon in the last four years.