What is the best store to buy dog supplies at? do yo know whats Basic supplies for the dog’s first day?poop bags, dog food (unless making your own), crate or baby gate, water and food bowls, toys, chews, bed, tooth brush and paste, brush, nail clipper. Book on dog or puppy care and training.You can improvise pretty much everything or leave it until the next day or so except for the collar and leash. If you are planning on feeding dog food then you need to pick up a bag of kibble or canned food as well. Chews and toys can help settle a dog in by giving him or her something soothing to do. A crate or baby gate will make house training much easier and faster. Small poop bags are also better than using grocery store sacks.For treats, you can use cheddar or similar cheese, chicken or beef pieces.If you are picking up a house trained adult you will need less than if house training a young puppy. jefferspet.com you will definitely love this store!