Any recommendations for car safety seatbelts/harnesses please, we have two dogs, a lurcher and a JRT. The little one uses a fabric travel crate currently but he's outgrown it. The big one has a car harness with a seatbelt clip on it but the strap is too short and she can't sit properly. Both have to go on back seat of car. Ideally I'd like both to have a harness and be safely clipped in but with freedom to lie down/sit up as wanted. Thanks.