Table 5: Number of puppies per litter in normal and affected groups.

BreedNumber of puppies per litter value
Disease absentDisease present

Small breed
 Chihuahua 0.000
 Dachshund
 Jack Russell
 Terrier
 Pekingese 0.001
 Pomeranian 0.001
 Poodle 0.000
 Pug 0.001
 Shih Tzu 0.006
 Yorkshire
 Terrier
0.000
 Mean ± SD3 ± 11 ± 1
Medium breed
 Beagle
 Bulldog
 (English)
0.002
 French Bulldog 0.008
 Crossbreed 0.000
 Shetland
 Sheepdog
 Thai Bangkaew 0.005
 Thai Ridgeback
 Mean ± SD5 ± 32 ± 1
Large breed
 American pit
 Bull Terrier
 German
 Shepherd
 Golden
 Retriever
0.000
 Labrador
 Retriever
0.000
 Rottweiler
 Siberian Husky 0.011
 Mean ± SD6 ± 33 ± 1