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Some disadvantages of crawl spaces are mostly regarding the air itself—moisture build-up and poor ventilation, which can cause problems both in the house and underneath it, even damaging the foundation itself. Crawl spaces are difficult to access and often invite unwanted pests during the hot summer months and the cold winter ones. These hard-to-seal spaces are also susceptible to water damage during periods of heavy rain or melting snow.

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.

Some suggest mothballs as a deterrent for iguanas, but they are ineffective and harmful. Mothballs contain chemicals like naphthalene or paradichlorobenzene, which are toxic to humans and animals, including iguanas. The fumes can cause respiratory problems, skin irritation, and other health issues. Moreover, using mothballs outdoors is not recommended, as they contaminate soil and water sources.

No, it’s not safe to leave a doggy door open. It might be more convenient, especially at night when you just want to lay in bed. However, when you leave it open, it increases the chance of other critters getting in without your knowledge. Also, it leaves your pup unsupervised for hours at a time.