How many dogs are there?<div><img src="https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQ7ox_w6yD7orEOhno749ye1ie8FjKrQkjEsA&amp;usqp=CAU" alt="How old is your dog in human years? Scientists debunk 'multiply by 7' age  rule"><br></div>