Any ideas or things you might have done to help gain subs?
1) Scrap your gaming videos and just do videos about your dog. I mean, good god man, look at how many views your dog video has so far. 19,031! My bet is you could add up all the views for all your other videos and they wouldn't equal that one video. However and unfortunately, your follow-up dog video hasn't gotten the same kind of a response. Only 600 views so far. Why not? I don't know. Maybe it is because it hasn't been out there long enough. But my bet is that you did away with the pleasant soft instrumental music and you talked. I could be wrong (and probably am wrong) but I don't think anyone wants to hear you command your dog around. Thus my advice is:
2) Start up a new channel and name it something that dog lovers would love. If possible, what lovers of your dog's specific breed would love. Then load up that 19,031-view dog video as video #1. I would not move your other dog video to that new channel but instead....
3) Just show your dog being a dog in subsequent videos. Get some more and different instrumental music for each video. Film your dog for hours upon hours and then edit that down to be the best three to four minutes (no longer!), and put that out as a video. A week's worth of video distilled down to 3 to 4 minutes of the golden best.
4) Take your dog to new and interesting places. Make these "First time at [fill in blank]" videos. There should be tons of parks around you within easy commuting distance. Not to mention dog parks and all the other dogs there. Remember that if you film the owners, you need to get them to sign release forms. Google "film release forms", print off 100 copies, and before you enter a dog park or even take your dog out of your vehicle, go in and see if all those in the dog park will sign the release forms. If someone won't sign, don't then film but politely wait for them to leave. Don't record the owners speaking. Them smiling for the camera as they interact with your dog should be more than enough.
5) If you want to monetize your videos, lengthen the videos to 7 minutes and do a mid-roll YouTube ad. Do a cute breakaway for it. Subtitle it with something like: "Now for a short commercial break while [name of your dog] does it duty. New music after the break." Then use new music after the break. A complete song for before the commercial break and a complete song after the commercial break.
6) Do a non-verbal plug for a rescue organization for your dog's breed at the end of all your videos. Put an annotation that will take viewers to that rescue association's website. I think you can add annotation to your 19,031-view dog video without losing its views. Research this to be sure! If you can, put in an end-credits plug for the rescue club on that video as well. Word will eventually get to that association that you're giving them a free plug. They may return the favor by plugging your YouTube show to their members.
7) If you are willing to spend a little money, do a YouTube ad campaign focusing on the name of the breed of your dog. You might even want to look into doing a Google Adsense campaign with your dog's breed as the search term.
Good luck!