Probably because the grants require it, the bioethics committee will watch for it, and the laws regulate it [1]. So if there is a minimum possibility of walking the dogs or enrich their lives, will be used extensively.

[1] (See for example: Council of Europe – European Convention for the Protection of Vertebrate Animals used for Experimental and other Scientific Purposes (ETS No. 123). Strasbourg 1986).

Lets don't be so dumb as to ignore that this is a tightly, strictly, closely regulated field

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And also because the investment in money and time is too expensive that nobody wants the risk to neglect the animals and lose it. Not when your entire career, income and wellbeing of your partner and children depends on this animals. And because they are humans of course and like to interact with their lab animals.

Animals that will be used later in extremely critical experiments that could cure horrible diseases forever in both humans --and pets--. Don't forget that. If a medicine for humans is tested in dogs, will be developed for humans but also for dogs at the same time, so, yes there is a sacrifice, but also a big reward for every dog in the planet.

But this will not be discussed because this kind of articles hallucinating hells of crying mice and psycho/broken-hearted lab people, have been written with two obvious purposes: 1) luring naive donors and part them from their money and 2) discourage young adults to work in a field that is critical if we really want --to reduce-- animal and human suffering.

And this is a criminal move, and should be ashamed and mocked every single time.