What is the passive voice?

Can you please help me change the following sentences from the active into passive voice. I already have the answers, those in red, but I am not so sure.

1. Practically all spaniels have an affectionate disposition.
(An affectionate disposition is practicaly had by all spaniels.
An affectionate dispostion is practically possessed by all spaniels.)

2. All dogs of this bread have pendant ears.
(Pendant ears are had by all dogs of this bread.
Pendant ears are possessed by all dogs of this bread.)

3. The cocker spaniel usually has a silky coat.
(Silky coat is usually had by the cocker spaniel.
Silky coat is usually possessed by the cocker spaniel.)

Thanks you very much.

Vladi

[Mister Micawber]

Vladi, I cannot believe that you are required to turn these active sentences into the passive voice-- they are incredibly awkward and would never appear in the natural language.

However:

1. Practically all spaniels have an affectionate disposition.
1a. An affectionate disposition is had by practically all spaniels.

2. All dogs of this breed have pendant ears.
2a. Pendant ears are had by all dogs of this breed.

3. The cocker spaniel usually has a silky coat.
3a. A silky coat is usually had by the cocker spaniel.