How can I get class member names and values without using vars() or __dict___

When my class doesn't override __slots__, I can get the names and values of all the members of an instance of the class. For example:

class Animal(object):
    #__slots__ = ('legs','name','color','smell','age','kids')
    def __init__(self):
        self.legs = 2
        self.name = 'Dog'
        self.color= 'Spotted'
        self.smell= 'Alot'
        self.age  = 10
        self.kids = 0

a = Animal()

for x in vars(a).items():
    print(x[0],x[1])

And the output is

age 10
legs 2
name Dog
kids 0
smell Alot
color Spotted

However, if I uncomment the __slots__ = ... line in the code above and run it, I will get an error that says vars() argument must have __dict__ attribute.

Is there anyway I can get the names and values of all the members when __slots__ is overridden?