I would say as a single semi vegetarian you will do  great here.

Me and my familiy used to live in US  and I am vegan .

My honest opinion is that you will be able to save much better than US,you will be tax free since you are making under 85k and everything is paid and handled.Also I am using Skype to talk to my family back in US ,the connection is great (it takes sometimes a month to get you internet if you don't have it yet in the villa).

I also bought a wireless skype  phone and it can be used any place in the house  incase you are  expecting a call and you don't want to sit and wait infront of the computer,it cost less than $50 and it's worth it.

Can't say much about vet doctors,don't have any pets yet,but there are lots of people with cats and dogs over here.Some useful websites:http://dohavets.com/

http://www.qatarsites.com/dir/qatar-pets

About vegie foods...There are  so many varieties of friesh fruits and vegetables and the prices are much cheaper than US.There is a nice vegetable market  which is even cheaper than the stores.

Unfortunately there isn't a lot of organic food,very difficult to find and prices are ridicilous.American brands are as twice more than the US ,but you will find great European or local products .

Dress code is not as strict as you think,I am sure you will be fine here the way you are .

I hope you enjoy your experience in Qatar!

Good luck and if you ever need any help or you have any question,don't hesitate to send a message!