Write down your reasons for contacting the dog seller. For example, if you are writing to inquire about a particular dog or puppy that the person is selling, write down what you want to know, such as information about the breed, the breeding process and the price of the dog. For letters that address a problem or issue between you and the seller, write down the issue and how you plan to resolve it.
Start your letter in a respectful manner. Use a prefix such as Mr., Mrs., or Ms., followed by the person's full first and last name.
Get to the point at the beginning of your letter. Start with a friendly, yet professional introduction. Address your main point, immediately following the introduction. Do not waste your reader's time by giving a long drawn out story that is not relevant.
Reference the list you made earlier regarding why you are writing the dog seller. Include all information you want to discuss at the beginning of your letter. Consider the beginning of the letter as a summary of what you have included in the rest of the letter. The body of the letter is your opportunity to discuss each point in depth.