Your instincts are correct, in that since you bought the two, their wellbeing is now your responsibility.
Please take measures to keep your dog away from the budgies. Don’t underestimate your dog just because he’s okay with the chickens. Small flighty birds such as budgies can spark a latent predatory instinct in dogs, and it’s always best to err on the side of caution whenever predatory animals like dogs and cats are near prey animals such as birds.
You will need to see your two budgies as individuals, and appreciate Cassini for her unique personality, even though she doesn’t seem as outgoing as Juno. She is just as much a living creature who deserves all the best, just like Juno. My two budgies, and all my birds have extremely different individual personalities. I’ll admit, some are definitely ‘easier’ than others, but they are all wonderful animals in their own right. It’s great that your two happen to get along. Consider yourself fortunate for that, as not all birds get along with each other.
You can do it. Start to look at each as their own unique animal, rather than wishing they will both act exactly how you’d like them to. You might, in time, have two budgies who adore you, but if one or both end up maturing and liking each other more than you, then it’s something you’ll have to accept. It might help to remember that budgies (all birds) even though they’re raised in captivity, are wild animals with wild instincts. Some individuals can eventually be ‘tamed’ to an extent, but they are not “domestic” animals like your family dog.
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