Aging

[sabrinah]

Are humans the only animals that show signs if aging, i.e. going grey, wrinkles etc?

[incitatus]

NO. Many animals age in much the same way. The reason they appear not to in the wild is that when you slow down you get eaten by something. The exceptions are things like carp, which seem to be immortal

[artisan]

Of course not. Tiredness seem to affect most older pets, as probably do things like tiredness.

[stoogmeister]

Dogs also go grey. Especially their faces, it seems.