We have just gotten a 7 month old male labrador from a friend. We already have a 5 1/2 year old female labrador mix with an arthritic shoulder. They get along just fine but my older dog is growling a bit and showing her teeth to the younger pup.. I understand why.. she’s older, she’s sore and she gets tired quicker. Occasionally the puppy plays too rough with my older dog and she yelps in pain (because of her shoulder) and goes after him to tell him off. We have gotten the puppy from a friend who wanted him to go to a good home for their own reasons and we said we’d try it out for 2 weeks at least (to see how both dogs get along.) All I’m asking for on here is a second opinion… is it too cruel to my older dog to get a rambuncious puppy when the older dog has lower energy and arthritis.. or will it be good for her to get her active and motivated more? I just don’t know what to do.. whether we should keep him (the pup) or not. Anyone else been in a similar situation? If anyone has any advice that would be greatly appreciated!!