You are going to live an inferior life because dog has separation anxiety? Really?

Apparently, you shouldn't have gotten a dog. You can't fix one bad mistake with another.

This is an extreme example, but you can have the dog put down, then become a vet or vegetarian and save way more animals.

If you make excuses like this, yes then you won't cut it in life. You can only take on so many responsibilities. If you want to be successful, take up as few as possible and be very successful at whatever you do. Get a good vibe from that. Then gradually do more. You have to help yourself first to be able to help others.

Maybe you should also mention the program(s) you are/were investing money and time in.

Also, your comment that you feel better because you quit a stressful job so you can 'enjoy' looking for a new job is silly. Who is to say the new job is going to be better? You might find yourself in a way more stressful position as a result. Why not find a new job first, then quit the old one? Backwards or short term impulsive thinking.
Especially since you get the exact opposite emotions from it as you expected?