Shh I know I put Losy and not lost.

Well after I ran ahead from my dog and went into a few caves killed things and came back out the dog still did not return to me. I was hoping all would be fine and that it might just take some time to catch up. I then used the fast traval feature to give it some time but that failed to work. This is about 2 IRL weeks ago. By not I'm thinking that he must be dead so when I go to buy a new dog from the guy in Markath I'm told "Sorry you already have an animal with you" and I'm unable to buy one.

Any ideas how I can find my dog?

Which dog do you currently have? Is it one you found or one you bought?

If it is the one you found go back to were you found it and the dog should be in that area.

It was the one I found. I'll head back to that shack today. Thanks for the help.

If it's Meeko then, yeah, he should have gone back to his shack when he got tired of waiting for you or lost track of where you were for long enough.