Were the dogs riding in the cargo area or the second row seats? If you search the Model Y forums there is a recent post from another dog owner who also experienced this issue. This could be injurious if the seat was to fold down on one of the dogs. I believe the other Model Y owner was going to temporarily place some gaffer tape over the rear seat release buttons so the dogs could not activate the seat release. I don't know if a dog could operate the manual release latches for the second row seats located behind each seat.