There is no possessive noun in the example sentence.
A possessive noun is indicated by an apostrophe s ('s) or just and apostrophe (') added to the end of the noun.
The noun "dinosaurs" is the plural form of the noun "dinosaur'
The sentence with the correct possessive form is:
The dinosaur's name should be George.
Note: The noun "George" is a proper noun, a name for the dinosaur. A proper noun is always capitalized.
Mr Dinsours
The word Pegasus is a proper noun, the name of a mythical creature, and should be capitalized. The plural possessive form is Pegasuses'.
No, Morrisons should not have an apostrophe in its name. It is a plural possessive noun.
The possessive form is Lois's.This is Lois's birthday.
my dinosaurs
The possessive form for the name Adams is Adams'.
The phobia of dinosaurs is ornithoscelidaphobia.
Carnivores
The possessive form of "it" is "its". (There is no plural form.) No possessive pronouns take an apostrophe: his, hers, ours, yours, its, theirs. "The dog is yours. Its name is Ben." Don't confuse "its" with "it's", which means "it is" or "it has". It is wrong to write "The dog is your's. It's name is Ben." Neither of the apostrophes should be there.
It should be capitalized when it is used in place of the person's name. In other words, it should be capitalized when it is not preceded by a possessive pronoun.
No, you do not need to use an apostrophe in a last name if it is not possessive.
The plural possessive form for the first name Ellis is "Ellises'".