I am noticing that Doggcatcher is more and more unreliable in reading podcast feeds which other apps access seemingly without problem.
The latest Podcast I've tried is the 'Get Religion' podcast which apparently works fine on other apps.
The feed is https://www.getreligion.org/podcast?format=rss
DC uses RSS URL’s provided by the publisher & relies on the publisher's servers to access media content (Audio & Video), other podcast managers may store media files on their own servers and currently not possible with the DoggCather app.
The 'Get Religion' podcast feed https://www.getreligion.org/podcast?format=rss - has a few issues (See Feed Validation Service - https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fwww.getreligio... )
I would contact the publisher of the feed and let them know the problem you're experiencing with the app at ( pfreeby (AT) me (DOT) com
I'm sure they will resolve the problem as quickly as possible.