Is my dog sick?

Maybe in the past week or two, i've noticed two things. First, on walks he has been wanting to stop every few minutes and rest or lay down. Just a few minutes ago I tried to take him for a walk, we got to the end of the block and he put the brakes on and wanted to just come home. Secondly, he hasn't been eating all his food and hasn't had as much of an appetite as normal.

Are these warning signs that he may be sick, should I take him to the vet or just continue to monitor and see if he gets better or worse?

He is a 13 month old Shepherd mix.

Thanks

I'd take him to the vet to be sure. It may be nothing, but it just doesn't sound normal for a 13-month-old Shepherd mix, which are normally energy and muscle lightly covered with fur!

not to worry you, i would take him to the vet immediatly. i had a 7 year old cocker who did the EXACT same thing. she didn't want to go on walks. didn't have much of an appetite, then she stopped eating totally. she died a couple weeks later. that prolly isn't what your dog has, concidering she is soo young, but go just to make sure.