Clarification on the dominance theory, this was brought to my attention elsewhere: dominance does exist in dogs, however it is not a simple pattern of "top dog, middle dog, bottom dog". It is very complex and varies between different wolf packs. In dogs, some groups display a dominant, but others do not. And the dominant dog changes depending on the situation. It is more similar to a modern family where both the mom and dad act as the leader in certain situations. But it is NOT the playground bully dominance as portrayed by dominance training. And dogs DO NOT humans as their pack. They have lived with us for thousands of years and absolutely see us as "human" and not "pack member".
With that, I agree that Stanley Coren should be read with caution. He has read studies and misinterpreted the data and come to conclusions that the study authors specifically stated were NOT to be concluded.
For example Dr Coren is quoted stating that according to one study "the patterns are clear that neutering increases aggressive behavior, specifically early neutering."
However, Dr Coren was NOT involved with the study. He has made that conclusion on his own.
Per the actual study, this is specifically warned against (bold mine):
There are important limitations to the study which must be noted. In particular, caution with regard to assuming a causal association between castration and problematic behaviours. While attempts were made to exclude animals that were castrated because of problematic behaviour, it is possible that some owners misremembered or incompletely reported the reasons behind their decision to castrate. Equally, there may be limitations regarding the applicability of the survey result to the companion dog population as a whole because people who sought out and completed the C-BARQ survey may be more engaged with issues surrounding problematic behaviours generally and may also have different views about the timing of castration when compared with companion dog owners as a whole.
If you want to learn more about animal emotions, including dogs, read some of the books by evolutionary biologist Marc Bekoff, Ph.D. and bioethicist Jessica Pierce, Ph.D. Very interesting reads. You can also find articles by them on psychologytoday.com (just do a search on their names).