Based on what I read, while it sounds contradictory at first but it’s clear in one interview that the pop singer Britney Spears admits that she’s not good with other animals other than her own. Emphatically, she said that she’s scared of dogs other than much smaller ones and some say that she’s allergic to cats.
Various stans have a weird habit of projecting their views and biases on the people they like and while the actual singers may be contrary, even contradictory as I could be guilty myself but then again the woman is rather reserved in person. However going by the interview and other official sources, she admits to being bitten by bigger dogs and in addition to having allergies, she could simply be looking for a pet that she can easily take care of.
She might not be that irresponsible but she’s a very busy person so she wouldn’t have time to care for a bigger dog. She’s got a family of her own. It’s also likely that when she meant by ‘scared of other dogs’, she might pose with a bigger dog but might still be uncomfortable with them in reality.
To give you a similar experience, while this is not always the case a lot of Southeast Asians either look down on, despise or avoid both stray dogs and mongrels. If some of them have these dogs, it’s because they’re cheap and useful. Purebred dogs can also be useful but they are esteemed higher for their novelty value. But there are some people looking to counter this discrimination and stigma if the rebranding of such dogs as ‘aspins’ and ‘Singapore Specials’ are any indication.
Or that Britney Spears isn’t so much of a general dog person as she’s specifically into puppies and small dogs. That’s not only consistent with reports and that interviews but also in older fan profiles where her favourite animal is enlisted as ‘puppy’. Her other relatives have bigger dogs but they’re usually supposed to do real work. Case is closed.