Yaheetech 2-in-1 Folding Pet Stairs Steps Ramp for Large/Small Dogs/Cats Wooden 3 Steps Pet Access Stairs/Ladders

Would this be strong enough for a bull mastiff?

Would the steps be suitable for use with a divan bed (only an inch off the ground) or would the top step end up too far away from the bed?

The descriptions says 'No assembly required", this doesn't fit with the comments about being hard to fit together. Is it self-assembly?

Does it fold up easily for storage?