I think it's too steep.....
But put something under the low end of it to easily reduce steepness, I use a concrete block set tall, not sure how high silkies can jump.
This is what we did. They couldn't seem to work out the ramp when little so put a block under it to reduce the slope. When they were bigger we just took it out again. Honestly though they still don't use the actual ramp much, they just jump up to the door now.
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