2. Advantages Dogs are very loyal pets. Dogs are much easier to train than birds or cats. Disadvantages Dogs are more expensive to feed than birds and cats. Dogs can be noisy.

3. Advantages Cats are quiet Cats can be left alone in the house Disadvantages Cats cannot be easily trained like dogs can. Cats are very independent. Cats are not very loyal.

4. Advantages Some birds can talk to you. Birds are always cheerful. Birds are easy to look after. Disadvantages Birds are noisy. Birds cannot be petted or held. Birds are can be messy.