One could argue that cats might but it isn't good for them to do.
Are humans the only animal that are able to drink milk as adults and not have it cause issues?
are also present in milk and are beneficial to the consumers if the lactose intolerance is not incapacitating.
While censusing, satellite tagging adult males and rototag tagging weaned pups of northern elephant seals (Mirounga angustirostris) at Playa Norte, Isla de Guadalupe (14 - 19 February, 2003), we opportunistically observed the stealing of elephant seal’s milk by feral cats (Felis catus) and western gulls (Larus occidentalis).
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It is generally classified as a mutually beneficial symbiotic relationship, though one could argue that it is closer to domestication. Source: https://en.wikipedia.org/wiki/Aphid#Ant_mutualism The reason I bring this up is because one argument against raising cows in a "factory environment" is because humans are the only species that drinks milk after adolescence.Indeed, they found three different SNPs (stands for Single Nucleotide Polymorphism; it is a common type of mutation), two of them having high prevalence in Africa (and people of African descent) and one having high prevalence in Europe (and people of European descent). Pastoralist populations Lactose tolerance is much more common in people descending from pastoralist populations than in people descending from non-pastoralist populations, suggesting a strong selection for lactose tolerance Durham 1991. 2007 focusing on the locus (one of the three SNP's mentioned above) showed that there is a clear selective sweep (which is a signature of past and present selection) around this locus. It is a classic, is short and is relatively easy to read, even for someone with only basic knowledge in evolutionary biology. I could not find any paper on the underlying genetics of lactose intolerance in dogs or other pets.They estimated the age of the allele allowing lactose tolerance at this locus (allele ; see nucleotide) at around 3,000 to 7,000 years (with a 95% confidence interval ranging from 1,200 to 23,200 years) and a selection coefficient of 0.04 - 0.097 (with a 95% confidence interval ranging from 0.01 to 0.15). It is not impossible our pets have also been under selection to be able to digest lactose as, we humans could have given milk to them.When I had dairy goats, excess milk was fed to adult dogs, adult cats, and many adult birds (e.g.chickens, guinea hens, peacocks, etc.) The chickens acted like it they were children and the milk was free candy!