I want to do a search across 2 tables that have a many-to-one relationship, eg

class User << ActiveRecord::Base
  has_many :pets
end

class Pet << ActiveRecord::Base
  belongs_to :users
end

Now let's say I have some data like so

users

id        name
1         Bob
2         Joe
3         Brian

pets

id        user_id  animal
1         1        cat
2         1        dog
3         2        cat
4         3        dog

What I want to do is create an active record query that will return a user that has both a cat and a dog (i.e. user 1 - Bob).

My attempt at this so far is

User.joins(:pets).where('pets.animal = ? AND pets.animal = ?','dog','cat')

Now I understand why this doesn't work - it's looking for a pet that is both a dog and a cat so returns nothing. I don't know how to modify this to give me the answer I want however. Does anyone have any suggestions? This seems like it should be easy - it doesn't seem like an especially unusual situation.