hello, so I'm new here. I've just adopted an 11 month old german shepherd mix...ive raised shepherds before, but that was on my parents property so exercise wasn't an issue, now i live in an apartment and i take my dog 'hero', out three times a day. morning for about 40 minutes , brisk walk / jog. afternoon for 30 minutes, brisk walk and then at night for a jog about 30 / 40 minutes. is that enough exercise? he's tired post the session but in 45 minutes is full of energy again! i don't have a yard... how can i exercise him better?... most days i work out of my apartment studio so he's quite content to lay around and watch me. but the moment I'm stepping out for work / meetings he gets excited again. is that separation anxiety? I've had him for about ten days now... help would be appreciated!