Related Posts Not Pulling Images

The bottom of each post has the Related Posts feature. The issue is that, most of the time, the related posts aren’t pulling in an image. The related posts DO have a Featured Image attached, so I don’t understand the problem.

Here’s an example of a post with no images in the related posts feature:

https://blog.bigbarker.com/k9-spotlight-lt-roca-k9-canto/

And here’s an example of one that does:

https://blog.bigbarker.com/say-highly-effective-treatment-canine-arthritis-no-side-effects-whatsoever/

Any ideas on how to make this ALWAYS pull an image?

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