How awful. I am so sorry this happened to your friend's pup. So sad.
I did a search on NY Dog Law, and found this. I don't know if it helps you, but it might...
from this web site:
http://www.doglaw.com/dog-bite-injur...-attorney.html
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New York’s dog bite law makes an owner strictly liable for an injured person’s medical fees and the veterinary bills of an animal bitten by the dog. If you were bitten by a dog, you may also try to recover additional monetary damages by proving that the biting dog’s owner 1) was negligent, 2) knew that its dog had a history of biting others, or 3) had their dog running around without a leash, or in a pack with other dogs.
A New York attorney can explain that the state’s dog bite law and dangerous dog regulations are contained in Secions 120 and 121 of the state’s Agriculture & Markets Law.
§120 Dangerous Dogs
Any person who witnesses an attack or threatened attack, or in the case of a minor, an adult acting on behalf of such minor, may make a complaint of an attack or threatened attack upon a person, companion animal, farm animal as defined in subdivision twenty-four of section one hundred eight of this article, or a domestic animal as defined in subdivision seven of section one hundred eight of this article to a dog control officer or police officer of the appropriate municipality. Such officer shall immediately inform the complainant of his right to commence a proceeding as provided in subdivision two of this section and, if there is reason to believe the dog is a dangerous dog, the officer shall forthwith commence such proceeding himself.
Any person who witnesses an attack or threatened attack, or in the case of a minor, an adult acting on behalf of such minor, may, and any dog control officer or police officer as provided in subdivision one of this section shall, make a complaint under oath or affirmation to any municipal judge or justice of such attack or threatened attack. Thereupon, the judge or justice shall immediately determine if there is probable cause to believe the dog is a dangerous dog and, if so, shall issue an order to any dog control officer, peace officer, acting pursuant to his special duties, or police officer directing such officer to immediately seize such dog and hold the same pending judicial determination as provided in this section. Whether or not the judge or justice finds there is probable cause for such seizure, he shall, within five days and upon written notice of not less than two days to the owner of the dog, hold a hearing on the complaint. The petitioner shall have the burden at such hearing to prove the dog is a "dangerous dog" by clear and convincing evidence. If satisfied that the dog is a dangerous dog, the judge or justice shall then order neutering or spaying of the dog, microchipping of the dog and one or more of the following as deemed appropriate under the circumstances and as deemed necessary for the protection of the public:
(a) evaluation of the dog by a certified applied behaviorist, a board certified veterinary behaviorist, or another recognized expert in the field and completion of training or other treatment as deemed appropriate by such expert. The owner of the dog shall be responsible for all costs associated with evaluations and training ordered under this section;
(b) secure, humane confinement of the dog for a period of time and in a manner deemed appropriate by the court but in all instances in a manner designed to: (1) prevent escape of the dog, (2) protect the public from unauthorized contact with the dog, and (3) to protect the dog from the elements pursuant to section three hundred fifty-three-b of this chapter. Such confinement shall not include lengthy periods of tying or chaining;
(c) restraint of the dog on a leash by an adult of at least twenty-one years of age whenever the dog is on public premises;
(d) muzzling the dog whenever it is on public premises in a manner that will prevent it from biting any person or animal, but that shall not injure the dog or interfere with its vision or respiration; or
(e) maintenance of a liability insurance policy in an amount determined by the court, but in no event in excess of one hundred thousand dollars for personal injury or death resulting from an attack by such dangerous dog.
Upon a finding that a dog is dangerous, the judge or justice may order humane euthanasia or permanent confinement of the dog if one of the following aggravating circumstances is established at the judicial hearing held pursuant to subdivision two of this section:
(a) the dog, without justification, attacked a person causing serious physical injury or death; or
(b) the dog has a known vicious propensity as evidenced by a previous unjustified attack on a person, which caused serious physical injury or death; or
(c) the dog, without justification, caused serious physical injury or death to a companion animal, farm animal or domestic animal, and has, in the past two years, caused unjustified physical injury or death to a companion or farm animal as evidenced by a "dangerous dog" finding pursuant to the provisions of this section. An order of humane euthanasia shall not be carried out until expiration of the thirty day period provided for in subdivision five of this section for filing a notice of appeal, unless the owner of the dog has indicated to the judge in writing, his or her intention to waive his or her right to appeal. Upon filing of a notice of appeal, the order shall be automatically stayed pending the outcome of the appeal.
A dog shall not be declared dangerous if the court determines the conduct of the dog
(a) was justified because the threat, injury or damage was sustained by a person who at the time was committing a crime or offense upon the owner or custodian of the dog or upon the property of the owner or custodian of the dog;
(b) was justified because the injured, threatened or killed person was tormenting, abusing, assaulting or physically threatening the dog or its offspring, or has in the past tormented, abused, assaulted or physically threatened the dog or its offspring;
(c) was justified because the dog was responding to pain or injury, or was protecting itself, its owner, custodian, or a member of its household, its kennels or its offspring; or was justified because the injured, threatened or killed companion animal, farm animal or domestic animal was attacking or threatening to attack the dog or its offspring.
Testimony of a certified applied behaviorist, a board certified veterinary behaviorist, or another recognized expert shall be relevant to the court's determination as to whether the dog's behavior was justified pursuant to the provisions of this subdivision.