Being old isn't a disease, but it does require some special considerations and extra care.
See the links below for some helpful info on geriatric pet care and specific diseases more common in our older pets:
Senior pet care FAQ's:
https://www.avma.org/resources...
Arthritis:
Take an arthritis quiz: http://www.cartrophen.com/for-...
Cartrophen Injections: https://www.avma.org/resources...
Cataracts:
Cataracts in dogs: https://vcahospitals.com/know-...
Chronic Kidney Disease / Renal Failure:
Chronic kidney disease in cats: https://icatcare.org/advice/ch...
Kidney failure: Where to begin: https://veterinarypartner.vin....
Renal failure dietary therapy: https://veterinarypartner.vin....
Cognitive Dysfunction (Dementia):
Recognizing canine cognitive dysfunction: https://www.petmd.com/dog/cond...
Management of dogs and cats with cognitive dysfunction: https://todaysveterinarypracti...
Senior pet cognitive dysfunction: https://vcahospitals.com/know-...
Congestive Heart Failure:
Congestive heart failure in dogs and cats: https://veterinarypartner.vin....
Information on furosemide: https://veterinarypartner.vin....
Information on pimobendan (Vetmedin): https://veterinarypartner.vin....
Liver Disease:
Liver disease in dogs: https://www.hillspet.com/dog-c...
Nutrition for dogs with liver disease: https://vcahospitals.com/know-...
Is it time for euthanasia? Quality of life assessment tools:
How do I know when: https://vet.osu.edu/vmc/sites/...
Quality of life at the end of life for your dog: https://vcahospitals.com/know-...
Cesar Millan quality of life scale: https://www.cesarsway.com/unde...
Grey Muzzle Quality of Life App for iPhones and Android: https://www.lapoflove.com/Qual...