20 Mind-Blowing Facts You Never Knew About How I Met Your Mother

8. Josh Radnor Is Allergic To Dogs

There's certain elements from How I Met Your Mother's early seasons that, on rewatch, really stand out against the direction the show took. Before their role was drastically reduced to account for the maturing actors, the kids had more of a rapport with Future Ted, while the musical interludes between scenes date the early episodes severely.

One the strangest elements, however, has to be Robin's dogs. Initially they were a defining part of the character, but suddenly in Season 2 they were written out. Was having five canines on set proving a logistical issue? Sort of - Josh Radnor was allergic to dogs, making the scenes he shares with them more difficult than Alyson Hannigan's kissing an ashtray/Jason Segel. It wasn't a clean break though; in Stuff, where Ted forces Robin to get rid of her pets, paramedics needed to be on call due to Radnor's close proximity to the animals.