Yes, "Guinea pig" should be capitalized as it is a proper noun referring to the animal species.
Yes, Was it a dog? Hahaha It WAS capitalized! Was can be capitalized.
No it shouldn't be capitalized. Seasons aren't capitalized.
Yes, "I am" is typically capitalized because "I" is a pronoun and should always be capitalized in English.
Yes, "Malaysian" is capitalized when referring to the nationality or language of Malaysia.
Yes, "Football" should be capitalized when referring to the sport in general.
Guinean Sports are very complicated, so bear with me. When you buy/adopt a guinea pig, obviously they are very fat and/or obese. So some people put guinea pigs into competitive sports... and there is your answer.
A Bissau-Guinean is a person from Guinea-Bissau or of Bissau-Guinean descent.
Guinean syli was created in 1971.
Guinean syli ended in 1985.
Guinean puffer was created in 1838.
Guinean franc was created in 1959.
New Guinean pound was created in 1915.
New Guinean pound ended in 1966.
Franco-Guinean Union was created in 1947.
Portuguese Guinean escudo ended in 1975.
Portuguese Guinean escudo was created in 1914.
New Guinean mark ended in 1915.