Mr. Editor — I send you the following instance of the memory, the sagacity, and the friendship of the dog, which you may insert in your valuable magazine if you think it worth the space it will occupy. Some years since, wishing to get a good Newfoundland dog for myself, and some for my friends, I mentioned the fact at the Jail office, where they had some fine stock, and was offered a slut. I had her put with a dog famous for his stock and his intelligence, and had a litter of fine pups. I got the slut accommodated in the loft of a stable and fed her regularly on raw lead beef, from the butchers' stall during her nursing. After I had distributed the pups, the slut returned to her old quarters at the Jail yard. The next year, happening to be at the Jail office, I was informaed that the slut, "Fanny," as she was called, had a fine litter of pups; I was invited to go and see them, and directed where to find them. I asked if their dogs were perfectly safe, and was told, tbat they would not meddle with me. I accordingly passed down into the yard, round the Jail, and passed between a high pile of broken stone and a ten foot building; on passing which, I came suddenly in front of a shed, or shop in which "Fanny" and her family were. The moment she saw me, she raised a sort of alarm howl, which was immediately answered by the dogs in another and remote part of the yard. I heard them coming round the stone, on my track, uttering sharp, angry yelps. I spoke to her, "Fanny!" and smiled. She immediately recognised me, and appeared very much mortitied that she had given me so unfriendly a reception. I stood terrified at the approach of the dogs, expecting to be torn to pieces in an instant, as there was no mode of escape! Fanny was immediately aware of my danger, and rushed past me, aod placed herself across the path, determined to protect me! She stopped the dogs, and by wagging her tail and kissing them, and by other signs, made them understand that I was a friend, and that all was right; and got them perfectly pacified before she would let them approach me. She then led them up to me, making the most friendly demonstrations, and assuring me of my safety. I then spoke to the dogs and caressed them; and after looking at the pups, I withdrew. "Fanny" accompanied me to the door, which led out of the yard, seeming much pleased with my notice, and saw me safe out of the premises before leaving me! I was satisfied that I owed my life to the memory and gratitude for former kindness of this noble animal. Yours, NIMROD. Boston, June 24, 1844.