Dear Dr. Fox: I have been using neem oil on my 80-pound dog and three cats for two years to protect against fleas and ticks. What is your opinion of neem oil? It has worked great, with seemingly no ...

Neem oil comes from the seeds of the neem tree (Azadirachta indica), a fast-growing member of the mahogany family native to southeast Asia. Typically expressed via a cold-pressing process, the oil is ...