Dogs age seven years for every human year: The rate at which dogs age varies by breed and size. Small dogs tend to age slower than larger breeds.
Dogs can only see in black and white: Dogs can see some colors, although their color vision is limited compared to humans. They primarily see in shades of blue and yellow.
A warm, dry nose means a dog is healthy: A dog's nose temperature and moisture can change for various reasons.
You can't teach an old dog new tricks: Dogs of all ages can learn new behaviors and commands with patience and training.
Dogs age out of playfulness: Dogs can remain playful and active well into their senior years. Age doesn't automatically reduce their playfulness.
Dogs age at a consistent rate: A dog's age-related changes can vary significantly depending on factors such as breed, size, and overall health.
Tail-wagging always means a dog is happy: While tail-wagging is often a sign of happiness, it can also indicate excitement, anxiety, or even aggression.
One dog year equals seven human years: The one-to-seven ratio is a rough estimate and doesn't apply to all dogs.