I will talk a little about on-page SEO, you got some issues here. We'll take this for example:
http://thepetreviewer.com/2016/10/23/dental-chews-ones-best/
Use postnames, and add targeted keyword in URL if possible.
Make sure to add your keyword in title and URL as smoothly as possible.
Make articles longer, a short description is not a review, although you are mentioning it a lot. Add fun facts, how to, did you know, etc ... Add actual data compiled from others reviews. Actually you should read some tutorials about how to write great articles.
Use proper headings, bold and italic format. In this article your title is H2, make it H1 and the only H1, the others can be H2 or lower.
When reviewing multiple items, write a list at the beginning of the article,containing all the products then make page jumps to their corresponding description
https://en.support.wordpress.com/splitting-content/page-jumps/ even ask the visitor to click its preferred item.
The ending paragraph of this article really sucks, you need to come up with something better. If you can't write a good ending, leave it blank, or just find a magic closing paragraph like a signature and write that every time.
Forget about categories and tags, improper use would do more worse than good.
Give a silo structure to your website, help google to better understand your content.
Forget about building links for now, bring your on-page to a proper level, and add more articles.
