Boston Terrier vs Shih Tzu: Which Suits Your Home?

The Shih Tzu is the smaller dog here by a good margin — 9 to 16 pounds and just 8 to 11 inches tall, versus the Boston Terrier's 12 to 25 pounds and 15 to 17 inches. Both are compact, flat-faced breeds bred for companionship rather than work, but the Boston is built more athletically under its short coat while the Shih Tzu carries a long, flowing coat that adds visual bulk without adding much actual weight.

Neither dog asks much of you physically. The Shih Tzu rates a 2/5 for both exercise need and energy level, while the Boston sits a notch higher at 2/5 exercise and 3/5 energy — moderate rather than low. Both are genuinely low-key breeds; the practical difference between them here is small enough that other factors should probably decide this one.

This is the clearest split in the comparison. The Shih Tzu's long, flowing coat rates a full 5/5 for grooming need — expect daily brushing and regular professional trims — though it sheds very little (1/5) and is often marketed as hypoallergenic. The Boston needs almost no grooming (1/5) and still edges it slightly on shedding at a low 2/5. If coat maintenance is a dealbreaker, the Boston wins outright.

Both breeds score a full 5/5 for apartment suitability and tolerate alone time about equally at a moderate 3/5. The Boston is the quieter of the two, barking low (2/5) against the Shih Tzu's moderate (3/5). Neither will be a problem for close-quarters living, but the Shih Tzu is more likely to sound off at noises from the hallway.

Both breeds work fine for a first-time owner — the Boston rates 5/5, the Shih Tzu 4/5 — and neither demands an experienced hand. Trainability tilts toward the Boston though, 4/5 against the Shih Tzu's 3/5; Shih Tzus are famously more stubborn about consistent obedience work, even if they're just as easy to live with day to day.

Both breeds get along well with other dogs (4/5 each), and both do fine with kids, though the Boston edges ahead at 5/5 against the Shih Tzu's 4/5. Friendliness to strangers favors the Boston too, 4/5 versus a moderate 3/5. The Shih Tzu isn't unfriendly, just a bit more selective about who gets its attention right away.

These two share more health overlap than most pairs on this site: both carry brachycephalic airway risk (BOAS) from their short muzzles, and both appear in patellar luxation data. Beyond that they diverge — the Shih Tzu's list adds kidney disease, liver shunts, and dental issues, while the Boston's stays focused on eyes and hearing. Lifespan actually favors the Shih Tzu's upper range, 10 to 16 years against the Boston's tighter 11 to 13, though its lower bound is also wider.

The Shih Tzu costs more to keep across the board: a 4/5 cost rating against the Boston's 3/5, $120–$250 monthly versus $80–$150, and $1,500–$3,000 in year one against $1,100–$2,300. Most of that gap traces straight back to grooming — that flowing coat needs professional maintenance the Boston's short coat never will.