Thank you so much. I'm very wary and exploring with caution so all this advice is very helpful. If I knew how to add more pictures I would share more - for some reason I can't see a button with an option..
In terms of some of the questions - I have x4 DNA certificates for the stud (male cavalier king charles spaniel) which all came back clear. I am asking for health certificates available for the mum (F1 cavapoo) and for the puppy.
I know it sounds silly and I can never truly know for sure, but having investigated their genuine and private personal instagram account (with their consent) I can see all the videos/pictures of the family life and how the puppy has been 'part of the family'. Their posts show a huge amount of love and affection for the mother dog and the puppy too - talking about how strong the bond is between them all and especially between the puppy and the baby! I know I can't rely on that but this part of the story seems genuine. But I can't rule out that there could have been a health issue as someone mentioned.
Ultimately I want what is best for the puppy but am very aware that issues can be hidden. I really hope it is all innocent/down to their naivity rather something more sinister.
Really appreciate the specific tips @Hekatestorch - if I ever work out how to add pictures and I do go ahead to pick up & rehome this pup I'll have to update you with a cleaned up, groomed version of him looking happy and dapper
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Also reassuring to hear @justasking111
Ultimately I will visit the dog in person on Thursday and make a decision.
I'm sure it will be distressing for the puppy leaving the house and its mother given it is a bit older too (16 weeks) and doing everything I can prepare to give it the best life ever (assuming I don't discover some health problem). If anyone has found particular tips or tricks work for settling them in I'm all ears.
I will also update on the colours as this seemed to gain interest!