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Tree sap is not usually dangerous to humans or pets. But some trees do produce dangerous sap. Notably, ash, birch, cedar and similar saps can irritate the skin but aren’t dangerous. Sap from trees like the Brazilwood, Mahogany, Milky Mangrove or well-named Poison Walnut can be corrosive, cause nausea, or trigger those with asthma. But for most backyard trees, protective equipment like a sturdy pair of gloves should be fine.

Brown recluse spiders are found in Midwestern and South Central states like Nebraska, Ohio, Texas, and Georgia. While it’s possible to find spiders from the same genus elsewhere in the country, you’re unlikely to find a brown recluse infestation outside of these designated zones. In any case, there are other dangerous spider species across the U.S., so always use caution when dealing with infestations of any kind.

Scented mouse deterrents, like peppermint oil, can be effective in the short term. The pungent smells may temporarily repel mice, but they lose effectiveness as the scent fades or mice get used to it. The main drawbacks are frequent reapplication and the fact that these deterrents don't address the root cause of the infestation, such as entry points or food sources. While they can be part of a broader strategy, scented deterrents alone are rarely enough to eliminate a mouse problem.

Some snake repellents are risky to use around people and pets because they use the active ingredient in mothballs, naphthalene. The United States Environmental Protection Agency (EPA) has classified naphthalene as a carcinogen that can cause damage to the liver, neurological issues, and cataracts. 

The Colorado State University Extension suggests there’s not enough conclusive evidence of the effectiveness of snake repellents to recommend their use.