Proposition-I have a dog

Truth value-True

Truth Conditions-For this to be factual I would have to own a dog that resides in my home.
Entailment-“I have a dog” entails you own an animal and have a

Proposition 2-I have 6 legs

Truth value-False

Truth Conditions-I would need 6 legs connected to my body

Entailment-“I have 6 legs” goes on to show I have more than the standard 2 legs.

Proposition 3-There is a lock ness monster that lives in the Amazon River.

Truth value-Unknown

Truth conditions-For this to be true, there must be a large mythical monster that calls the Amazon its home

Entailment-“There is a lock ness monster that lives in the Amazon” would entail a mythical monster not only lives but would call the Amazon River its home.