Answer:
There are 12 dogs
Explanation:
given the ratio of cats : dogs = 17 : 4
the 17 part of the ratio relates to 51 cats
Divide 51 by 17 to obtain the value of one part of the ratio
51 ÷ 17 = 3 ← value of 1 part of the ratio , then
4 parts = 4 × 3 = 12
there are 12 dogs in the shelter