its tail should look like a big lump of cotton
The ideal tail shape of a Kuvasz is low and not docked.
The ideal tail shape of a Ragdoll cat is long and thick.
The ideal tail shape for an Italian Greyhound is slender, tapering, and a curved end.
If you have or seen a Boston Terrier and there tail is kinked, it's just the way there tail is. it has never been broken. Unless somebody actually goes and breaks the dogs tail.
Bostons don't have a tail!
There are many non-shedding dogs. Here are some: Shih Tzu Yorkshire Terrier Maltese West Highland White Terrier Dachshund (moderate shedders) Bichon Frise Miniature Poodle Italian Greyhound Border Terrier Cairn Terrier Havanese Miniature Schnauzer Norfolk Terrier Silky Terrier Welsh Terrier Boston Terrier Scottish Terrier Chinese Crested Australian Terrier Wirehaired Fox Terrier Greyhound Bedlington Terrier Irish Water Spaniel Soft Coated Wheaten Terrier Basenji Kerry Blue Terrier Airedale Terrier Standard Poodle
When they aren't looking
No. Never.
My Boston Terrier was born with NO TAIL at all. Nothing. Nada. For quite some time I've wondered if this is a fault on the breed, but no one has been able to answer that. And I do mean NO TAIL at all.
Follow the advice of a Veterinarian
Yes, for example the tail shape or the wing shape.
Although it is unusual, a Boston Terriers tail can be crooked, have bumps, or the dog may have no tail at all.