I'm inheriting a puppy about 4 months old (max.) to live with me and my 4-1/2 year old half-chocolate lab - half I don't know. Both are female. Small house, small fenced yard, they've spent time together twice before and got along fine. Neither of them exhibit any aggressiveness, alone or when they were with each or, ever. Both very gentle. I'm thinking there may be some weird things happening though, because my 4-1/2 mixed lab has been the sole 4-legger resident (plus just me) since she was 8 weeks old. Anyone do this before? Any recommendations, cautions, "make sure ya do's" etc. They will have their own sleeping area, the 4-1/2 year old usually on the bed along side me, the pup in a 3' x 30" "cage" when not outside or when she's sleeping until she's house broken. I'm not worried, but I'd appreciate any comments/things to look out for. Thanks!