
This essay will analyze the breeding practices and training techniques of bichon frises and golden retrievers.
This is a split thesis. The difference here is there isn't anything to suggest why these two things, joined by the “and” are being brought together: What do breeding practices and training have to do with one another? Why these dogs? Why not throw the dog's diet and health problems in there, too? What about corgis and papillons, or poodles and labradors?
Tangential Topics
I think this problem stems from writers having a few related topics but never developing a significant correlation between them. They go through the brainstorming steps, the six journalistic questions, mind mapping, etc, and figure out their overall topic and the subtopics for their essays. In doing so, they find a couple of things they want to address, without exploring a reason to do both. A stronger thesis would be
Different breeds of dog require different training techniques; a hunting dog, like a golden retriever, will need a different training regimen than a smaller lap dog, like a bichon frise.
Note that the topics didn’t change, but it's no longer a thesis about training and breeding golden retrievers and bichon frises. Now it's a thesis that compares and contrasts training techniques for broader types of dogs.
Just because two topics are remotely related does not mean it is appropriate to write about both in the same essay. After all, the more specific you are, the further apart your different topics can become. Sometimes, you do need to broaden your topic.
Broadening to Consolidating
This does not mean you can take step after step back until you have “Dogs are interesting” as a thesis. Instead, it means recognizing you can get so specific you can't reconcile your different topics and you're left with a thesis that lists specific topics, and two essays pieced, Frankenstein-style, into one another.
Broadening happens so you can bring together similarities (or contrast differences) to specify your topic. If you're writing about dog training and dog breeding, you're writing about two broad topics. If you're writing about how to train dogs based on their different breeds, it’s probably going to be a single, solid essay. The reason for this is because you're not writing about these two topics, but instead the ways they intersect.

Conclusion
This is not to say that switching one set of conjunctions with another will solve your problems, nor is it to say that having “and” in a thesis will guarantee a bad thesis and “therefore” will guarantee a good one. The words we choose convey a lot of meaning no matter where they show up, but especially in a thesis.
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Works Cited
"AG Cody" by Rocktendo - Own work. Licensed under CC BY 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:AG_Cody.jpg#/media/File:AG_Cody.jpg
"Golden retriever dummytraining" by Dirk Vorderstraße - Own work. Licensed under CC BY 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Golden_retriever_dummytraining.jpg#/media/File:Golden_retriever_dummytraining.jpg
"PembrokeWelshCorgi Tryst.fullres". Licensed under CC BY 2.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:PembrokeWelshCorgi_Tryst.fullres.jpg#/media/File:PembrokeWelshCorgi_Tryst.fullres.jpg