Tuesday night's The Little Couple marks two big milestones for Bill Klein and Dr. Jennifer Arnold: It's their 100th episode, and they finally bring adopted son William home – where he meets his furry siblings for the very first time! (Watch the reaction above.)
Although the new parents were "nervous" about the introduction, dogs Rocky and Maggie did their part to ease the tension – at first.
In Tuesday's episode, William, who was adopted from China in March, is all smiles when the sometimes unpredictable doggy duo shower him with kisses.
"We were fearful that the dogs were not going to be very kind to Will," says Klein. "In the past they've not been really well behaved."
In fact, the welcoming committee's lovely licks turn into over-excitement very quickly. "When one of them started to bark, the other one started to feed off him," says Arnold. "So we knew that we were going to have to take this slow."
Meeting the pups is just one item on a long list of firsts for the couple, who have also adopted a daughter, Zoey, from India. They're waiting on final approvals and dates to be set so they can bring her home, too.
"Everything's a first," says Arnold. "Which is pretty exciting."
For more from The Little Couple's 100th episode and baby William's arrival, tune in Tuesday at 10 p.m. ET on TLC.