It's important to talk to your vet about any changes in your dog's behavior or diet, says veterinarian Nicholas Dodman. iStockphoto.com hide caption

Harold O'Neal. Luke Kaven hide caption

Anne Hathaway plays Maggie, a patient with early-onset Parkinson's disease, who falls for Jaime, a Viagra drug rep played by Jake Gyllenhaal, in Love and Other Drugs. David James/20th Century Fox and Regency Enterprises hide caption