Tomorrow morning, my family go on holiday (hooray!) My FIL is here to look after 4.5 month old puppy for the week. I have given him two pages of instructions as to training he needs, commands we use, boundaries we set, food, medicine, phone number of behaviourist/trainer and vet. However, I had not thought about how the puppy would feel when his own family all disappear 
. I have never left him for more than 2 hours before. Will he be ok?