This is Mark attempting to ingratiate himself with Maddie. Sadly, Maddie is a one person dog and follows holly with a devotion I've seldom seen. Oh sure, she'll stick around for a cuddle and some stroking, but she never stays away from Holly for too long.
See, all's well now.
That's not to say Maddie doesn't like Mark, no, she loves him dearly, but like many creatures, tends to be with the one who is always around and for now, that's Holly.
A fox outside Mark and Holly's porch in Aledo.