Hello,
I am writing in regards to the pet store position that you have open. I am extremely enthusiastic about this position, and believe that I have the skills and qualifications that you are looking for.
I have always been passionate about animals, and have been around them my entire life. I have experience working in a pet store before, and have also volunteered at various animal shelters. I am confident in my ability to care for and sell pets, and would love to put my skills to use at your store.
I am also very knowledgeable about the products that are available for pets, and can offer customers guidance on what would be best for their animal. I am friendly and outgoing, and believe that I would be an asset to your store.
I would love to come in for an interview to further discuss my qualifications and experience. Thank you for your time, and I look forward to hearing from you soon.