I ordered these restraints for my 15 lb dog. Cairn Terrier so he can ride with me in my vintage cars. They are a good length and seem strong enough for him. I would not recommend them for heavier dogs, they are quite thin. They easily attach to his seat belts. I haven't tried using a seat belt buckle (because they don't work in my car's seat belt buckles), but I've tested it and it snaps into my modern car's buckles.
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