Even Wilfred appears to be warming to Adam, providing him with a clean set of clothes and accompanying him to the pub.
Over a couple of beers Wilfred questions Adam’s motives, and warns him not to leave Sarah like all her previous boyfriends have done.
Adam responds that he loves Wilfred and to prove it he decides to spend some quality time with him.
Adam obtains the keys to Sarah's attic, where he and Wilfred have a bonding session – drinking beer, smoking weed, playing pool and watching porn.
In retaliation, Adam successfully plays the hand in warm water trick on Wilfred, to grudging respect.
Wilfred begins to dig up old dildos in the garden, prompting Adam to question Sarah about her opinion on sex toys.
When Sarah cooks lamb chops for dinner, Adam attempts to lace Wilfred's serving with a dog laxative.
After Wilfred displays behavioural problems, Adam calls Jack Underwood, a reality-TV vet.
Keith, a well known film star and "old friend" of Sarah's, comes to visit and brings extravagant gifts.
Although Sarah is already beginning to tire of Keith's tall stories and self-absorption, Adam and Wilfred believe that they are being usurped, and concoct a plan to deal with the situation.
The pair leave the house in disgrace, and Adam and Wilfred regain their peace of mind.
Sarah is devastated and insists on seeing the body, but he claims to have already cremated and buried Wilfred on a mate's farm.
Sarah conducts a backyard burial ceremony for "Wilfred" (actually a pile of bloody bones that Adam has obtained from a butcher).
Sarah later forgives a bruised and battered Adam, as she believes his goal was to save her the trauma of knowing Wilfred had run away.
Wilfred realises how much he misses Adam, and in his anxiety begins to dig enormous holes in the garden.