My Pat, who passed two years ago, started developing arthritis when she was nine - she didn't like jumping too high or going down stairs. She was a devon rex, which apparently are prone to it? She loved to sit on my electric blanket and draped over the hot parts of my computer! my vet proscribed...
eggs are a great source of protein, healthy carbs and good fatty acids, (the carbs are epecialy good for animals that shouldn't consume grains, like cats!). The albumen of raw eggs can serve as a digestive aid - I give my three year old siamese a raw egg with some turkey mince every morning...