doghome
It's time that Pennsylvania enacted reasonable and responsible anti-tethering legislation.
A study by the Centers for Disease Control, "Which Dogs Bite?", found that chained dogs are 2.8 times more likely to bite. 
The dogs most likely to bite are male, unneutered, and chained.

The American Veterinary Medical Association (AVMA) has also stated "Never tether or chain your dog because this can contribute to aggressive behavior."
Pennsylvania Local Laws

Abington, PA (Montgomery County) - March 13, 2014

This ordinance lists the conditions under which dogs may be tethered, requiring access to food and potable water, sanitary shelter space, and safe surroundings.

S 58-2.  Rules and Regulations for the Tethering of Dogs Outdoors

1. It shall be unlawful for any person to tether, fasten, chain, tie, restrain, or allow a dog in such person's care or located on such person's property to be fastened, chained, tied or restrained by means of a rope, chain, strap, or other physical restraint in a matter that ... click here to read more

Harrisburg, PA (Dauphin County) - May 14, 2013

Dogs may not be tethered for longer than it takes the owner or responsible person to complete a temporary task for which the dog must be restrained.  Dogs may not be left outside unattended in severe weather.

3-505.6  Tethering of Dogs Outdoors

1. It shall be unlawful for any person to tether, fasten, chain, tie, restrain, or cause an unattended dog to be fastened, chained, tied or restrained to houses, trees, fences, garages, stakes or other stationary or highly immobile objects by means of a rope, chain, strap or other physical restraint for the purpose of confinement, except in circumstances where all of the following requirements are satisfied ... click here to read more

Hazelton, PA (Luzerne County)

Ordinance 2006-9  Dog Owner Responsibility

2. Containment

a. All dogs shall be securely contained to their owner's property, but may not be inhumanely restrained by tying to a restraint for more than 8 continual hours per day.

Mount Wolf, PA (York County) - April 2012

This ordinance limits the manner in which an animal may legally be tethered.

If a dog is tethered outside:  The tether shall be attached to the dog by a non-choke type collar and attached to the stationary object by swivel anchors, latches, or similar devices in a manner which prevents the tether from becoming entangled around any object so as to limit the dog's freedom within the tethered area, or prevent the dog, or any of its appendages, from becoming entangled by the tether.  The dog shall have easy access to clean drinking water and adequate shade and/or shelter within the tethered area.  The dog is periodically monitored while tethered for the aforementioned reasonable period of time.  The dog is not to be tethered or left outdoors for a continuous period of time greater than one-half (1/2) hour if the temperature during such period remains entirely either below thirty-two (32) degrees Fahrenheit or above ninety (90) degrees or during any period in which severe weather warning has been issued for York County by the National Weather Service.

New Castle, PA (Lawrence County) - February 12, 2015

717.09. Tethering of Dogs; Prohibition of Keeping Dogs Outdoors in Extreme Weather
(Ord. 8123. Passed 2-12-2015.) Ordinance 

(a) It shall be unlawful for any person to tether, fasten, chain, tie, restrain or cause an
unattended dog to be fastened, chained, tied or restrained to houses, trees, fences, garages, stakes or other stationary or highly immobile objects by means of a rope, chain, strap or other physical restraint for the purpose of confinement, except in circumstances where all of the following requirements are satisfied: ... click here to read more

Pittsburgh, PA (Allegheny County) - December 15, 2014

This ordinance allows tethering only for the amount of time it takes for the guardian to "complete a temporary task."  It also provides restrictions based on weather conditions, including a limit to 30 minutes of continuous tethering if the temperature drops below freezing.

633.23 Tethering of Dogs; Prohibition of Keeping Dogs Outdoors in Extreme Weather

1. It shall be unlawful for any person to tether, fasten, chain, tie, restrain, or cause an unattended dog to be fastened, chained, tied or restrained to houses, trees, fences, garages, stakes or other stationary or highly immobile objects by means of a rope, chain, strap or other physical restraint for the purpose of confinement, except in circumstances where all of the following requirements are satisfied ... click here to read more

Ellwood City, PA (Beaver/Lawrence County) - April 15, 2015

Borough of Ellwood Borough, Pennsylvania - Ordinance #2508

  WHEREAS, the Council of the Borough of Ellwood City deems it advisable for the public health and welfare of the Borough to provide prohibitions of the tethering of dogs and keeping of dogs outdoors within the Borough as further set forth below; and

  WHEREAS, enactment of such an Ordinance in other jurisdictions has produced less incidents of nuisance dog barking, reduction the number of attacks on children by tethered dogs, lessened animal cruelty and promotes responsible dog ownership; and ... click here to read more