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Help with foster separation anxiety
Background... We took in a young (1-1.5 years) male boxer yesterday. He was found tied to a bridge overpass yesterday morning in 35 degrees 
he's so sweet and getting along great with our 6 yr female boxer. He has some training (sit, stay, shake, lay). Can't believe some idiot would leave him like that.
A few issues related to the larger anxiety problem:
not neutered (the rescue has an appt on Thursday for it)
he's been marking (at original persons house, at vet, at our house), then this morning he flat took a long leak on my carpet. Not sure if he was ever housebroken, but we're treating as if not.
so far he is ok with the crate, but only if not alone in it. He will cry/howl/bark and he peed all over it when we had to leave the house for 15 min.
Im reading some tips online, ad would love some practical ideas. I work a full time job, so I have Sunday to figure out this crate thing with him. I'm working on enforcing with teats and praise, and rewarding longer periods of the 'stay' command. He's currently snoozing with the door open while I lay on the floor beside him.
Thanks
Re: Help with foster separation anxiety
5 cats. 1 baby.
As for the SA and crate, it may just be a combo of not being house broken, being in a small space when he may have never been contained. I would make sure you have no blankets or towels in the crate with him.
Start working on NILIF (look in FAQ or google it). It should help with the crate training. Remember to never let him out of the crate while he's crying or you will reinforce that this behavior = release and he will get worse. Even if you have stand their silently until he takes a break from crying before you can let him out. Once out, IGNORE him. Let him settle down before you give him attention. I know this is hard when he's in so need of love and affection.