I have two guinea pigs and a dog, dog absolutely loves watching gps in their run for about an hour then ignores for rest of day. Four days ago one gp died and I bought another one because they dont do well on their own. Dog absolutely obsessed with new gp! Its the same colour as the other one, he has only seen it fleetingly when I transferred it into hutch but he spends all day glued to the window looking at the hutch. How does he know its a different one !!