1. i have a trainED dog.

2. i don't want to buy a messY dog.

3. his parrot is very noisY.

4. я не вижу ошибок :0

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1. budgies are AS talkative as parrots.

2. dogs are the moST loyal pets.

3. my cat is heavIER than my dog.

4. iguanas are not as dangerous as snakes/iguanas are less dangerous than snakes.

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1. lazyer -> lazier

2. largeer -> larger

3. noisyest -> noisiest

4. that -> than

(: