Eric isn’t in the previews (see here) for tonight’s Wilfred, but based on the tweets from the director a few months ago, he should appear in one of the two episodes that air tonight, starting at 10 pm.
“Compassion / Isolation” Episode 9 – Ryan’s resentment of his eccentric mother is exacerbated when Wilfred starts treating her like the mum he never had.
“Isolation” Episode 10 – Wilfred uses Ryan’s unhealthy habit of isolating as a means to rid himself of a neighborhood pest.