Final answer:
People who work closely with ponies may experience throat problems due to allergens such as dust, dander, or mold found in the animals' environment, potentially leading to respiratory issues or allergic reactions.
Step-by-step explanation:
The question seems to be mixing two distinct concepts: one is related to the historical context of a tomb rubbing showing ancient activities such as milking different animals, and the other is a health-related issue concerning people who take care of horses, or in the historical context, possibly rub down ponies, and experience throat problems. Regarding the latter, it's plausible that people who work in close contact with animals, including ponies, may experience throat problems due to allergens such as dust, dander, or mold often found in the environment where animals live. Constant exposure to these allergens can lead to respiratory issues, including throat irritation or allergic reactions. However, without more context, it's challenging to provide a definitive explanation for this specific case.