From the information given,
total number of animals = 45 + 30 + 5 + 10 = 90
Number of dogs = 45
Number of cats = 30
Number of birds = 5
Number of Rabbits = 10
a) the empirical probability that the next animal she treats is a bird = 5/90
P(Bird) = 1/18
b) the empirical probability that the next animal she treats is a rabbit = 10/90
P(Rabbit) = 1/9
c) the empirical probability that the next animal she treats is a dog = 45/90
P(Dog) = 1/2