I just came upon a great site today, Animal Hospice that offers a FAQ section to help you make this decision. To quote, "We suggest sitting with the ailing animal and be very quiet. From this place of quiet and peace, share with the animal that the illness or old age is irreversible and that you are open to hearing or feeling what the animal's wishes are about the future." What a beautiful idea. As someone who meditates regularly, this seems like excellent advice.
Nikki Hospice Foundation for Pets is another excellent resource. Their site includes links to products such as wheelchairs for dogs, animal incontinence products, and harnesses that people can use to help support an animal who has difficulty walking.
The International Association of Animal Hospice and Palliative Care is a membership-based organization that provides information to both animal parents and to professional providers about animal hospice.
And sadly, a final resource, In Home Pet Euthanasia offers a listing of providers throughout the United States and Canada who will perform pet euthanasia in the comfort of your own home. If like I did, you feel that is the best option for an ailing animal companion, this site may be able to provide you with a referral to a provider in your area.
May all of our beloved animal companions live long, healthy lives!