ur dog has just died. first try and find out exact illness for his death...frm the symtoms of it, to me it seems that it had PARVO, and the dead dog must hv left PARVO VIRUS where he pissed and pooped. and the virus will be killed/disinfected with clorin bleech (take ala bleech and mix it with water, ration 2 caps in 2 ltrs). and clean the house, floors, cloths, shoes, whatever the dog has touched/licked. IT IS IMPORTANT AS IF YOU DO NOT DO THIS, YOUR NEW PUP WILL BE INFECTED. And wait for atleast 2-3months before you get new puppy.