Dogs

4. the surgical removal of the uterus and ovaries
5. the joint in the hind limb of quadrupeds located distal to the stifle, "ankle"
7. the record of an animal's ancestry, a "family tree"
10. surgical removal of the testicles
11. the group of dogs developed to work for humans in the form of guard, police, rescue or sledding dogs
12. group of dogs with a variety of sizes and characteristics
13. the heat period of a female dog
15. the size, shape and form based on the ideal breed standard of the dog

1. (2words) where dogs are bred without regards to pedigree, defective traits, or overall care, "puppy factories"
2. group of dogs developed to aid the livestock herder
3. the act of a dog giving birth
4. the group of dogs developed to assist the hunter in the capture and retrieval of feathered game
6. the first milk produced that contains important antibodies
8. the group of dogs developed to hunt by sight or scent
9. the average time for this is 63 days
14. the joint in the hind end of quadrupeds that is proximal to the hock, "knee"
16. the group of dogs developed to be small companions