A terrier's courage in a very small body
Yorkshire Terriers were working ratters before they were ornaments, and fireworks tend to bring out the terrier: barking at the bangs, patrolling, trembling with arousal as much as fear, and refusing to accept that the situation is not his to manage. At the same time he is a dog of only a few pounds, easily injured and easily chilled, so the plan has to honour both halves. Spend the afternoon on a good sniffy walk and some play so he starts the evening exercised, feed him early, and settle him where the family is, because a Yorkie alone in another room will add abandonment to his list of grievances and bark it through the door.
The blanket nest beats the lap
It is tempting to carry a trembling Yorkie all evening, but laps are high, hands get tired, and a startled small dog can launch himself out of arms at the worst moment. Build his station at floor level instead: a bed or blanket nest beside your chair where he can burrow, press against your ankle and come out when he chooses. If you do pick him up, do it seated, support his whole body and set him down before standing. Keep him off sofa arms and bed ends for the night, block access to stairs he might race in a panic, and warn children that the nest is a no-reach zone, because small hands grabbing at a burrowed, startled terrier are how fingers and dogs both get hurt.
Sound, trembling and when to worry
Barking, shaking, clinginess and a refused dinner are the standard Yorkie fireworks picture and usually pass with the noise. Give him a chew or licking mat to work on, keep background sound playing and your own responses relaxed and brief, and let him bark without a running argument about it. Small dogs lose heat and energy faster than large ones during long stress, so offer water and a little food during quiet spells on long display nights. Contact a veterinarian if he is injured in a fall or scramble, if the trembling and panting do not ease once the sky is quiet, if he vomits repeatedly or seems weak, wobbly or unusually sleepy, because little dogs have smaller reserves when something is genuinely wrong.
Gaps, doors and the invisible exit
Yorkie escapes are quiet. The dog is under the blanket, then he is not, and nobody saw a door moment he could have used, except the one where a guest's ankles filled only most of the doorway. On fireworks night, close that route down: keep his room's door shut during arrivals, use a gate if the household comes and goes, and fit a draught strip or blocker to any door whose bottom gap he can genuinely use. Keep his collar or harness identification on him indoors for the evening, check the fit is snug without rubbing his delicate neck, and do a deliberate headcount of the dog before the house settles for the night, not an assumption based on the blanket nest's shape.
A lost Yorkie in the dark is nearly invisible and may hide silently from strangers, so KinsLe's Lost Pet Alert System helps by alerting nearby members to search properly and letting anyone who finds him message you directly through his profile.