Animals have come to mean so much in our lives. We live in a fragmented and disconnected culture. Politics are ugly, religion is struggling, technology is stressful, and the economy is unfortunate. What's one thing that we have in our lives that we can depend on? A dog or a cat loving us unconditionally, every day, very faithfully.
Any kind of creative activity is likely to be stressful. The more anxiety, the more you feel that you are headed in the right direction. Easiness, relaxation, comfort - these are not conditions that usually accompany serious work.
City life is stressful. Everybody is running around like crazy, stuck in traffic jams trying to make meetings, trying to make ends meet, trying to meet deadlines, trying to get kids to and from activities. There aren't enough hours in the day for all this business.
I'm a workaholic, so I ignore the signs of fatigue and just keep going and going, and then conk out when I get home. It can be pretty stressful.
Working a job I love is mentally less stressful than punching in a clock everyday, but it's a lot busier.