VET. 3 lbs is probably close to 5% of his body weight, a large amount to lose in a week. Especially for such a young dog.
I dont know how else anyone could help you. If you had a child that didnt eat for a week would you not take them to the doctor?
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~Emergency Vet Tech
Berlin vom Spartanville 1/13/13
2008 - 7/23/12
"Take this trouble from me: Make sure my shepherd dog remains a working dog, for I have struggled all my life long for that aim." Max Von Stephanitz