To find the decimal equivalent for the number of dogs weighing less than 20 pounds, divide the number of dogs under 20 pounds by the total number of dogs:

$\frac{4}{9} = 0.4444\ldots$

The decimal equivalent is approximately 0.44 (rounded to two decimal places).

Would you like further details or have any questions?

Here are five related questions to expand your understanding:

1. What is the percentage equivalent of 4 out of 9?
2. How do you convert a fraction into a percentage?
3. If 7 out of 10 cats weigh more than 10 pounds, what is the decimal equivalent?
4. What is the decimal representation of 1/3?
5. How would you round 0.4444 to the nearest hundredth?

Tip: When converting fractions to decimals, divide the numerator by the denominator.