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82 votes

Why shouldn't dogs eat chocolate?

The reason is simple: Chocolate contains cocoa which contains Theobromine. The darker the chocolate is (meaning the more cocoa it contains) the more theobromine it contains. This is a bitter alkaloid ...
Chris's user avatar
  • 51.7k
25 votes

Why shouldn't dogs eat chocolate?

The toxic ingredient in chocolate is in the mythylxanine class, a substance called theobromine. It is much like theophylline; overdoses of theophylline used to be very common before the advent of ...
anongoodnurse's user avatar
14 votes

Why are dogs descendants of Wolves but humans are not descendants of chimpanzees?

The very simplistic answer is that dogs and wolves belong to the same genus and are so closely related that they are often considered to be parts of the same species. The genus is Canis (Latin for dog)...
bob1's user avatar
  • 12.5k
12 votes
Accepted

Why do these 2 dots frequently occur in dogs' eyebrows? Does it serve/served any advantage?

I suspect but can't prove that these markings are not adaptive, but are accidents or epiphenomena of the general genetic system that determines coat colour. On the one hand, an Australian Broadcasting ...
Ben Bolker's user avatar
  • 5,364
10 votes

Best colour for a dog to track an object against green background

Dogs are a dichromatic species, featuring only a long wavelength (L) and a short wavelength (S) cone (source: Smithsonian). As such, they are thought to perceive mainly blues and yellowish hues (Fig. ...
AliceD's user avatar
  • 52.5k
8 votes
Accepted

Can dogs see infrared radiation, i.e., heat?

A dog's nose can even sense weak thermal radiation, as found out recently by researches at at Lund University and Eötvös Loránd University. So strong thermal radiation can be detected from a couple of ...
iLuvLogix's user avatar
  • 476
5 votes

Has artificial selection / selective breeding ever been targeted at intelligence?

Has it ever been attempted to breed a species, for example dogs, to maximize some aspect of intelligence? Yes, perhaps unintentionally, but certainly to serve a purpose: to better herd sheep. Border ...
anongoodnurse's user avatar
3 votes

Why shouldn't dogs eat chocolate?

I had a chocolate loving dog. She was 12 lbs. The vet said she could have it, provided she wasn't given too much. So his rule of thumb was not to feed her more than I would allow the average 2 year ...
DCook's user avatar
  • 141
3 votes

Could we breed a dog to the size of a thumb?

As mentioned above the inbreeding required to select smaller and smaller dogs would be problematic because of the myriad of health problems that would be associated with it (see inbreeding depression)....
PlantPromoter's user avatar
2 votes

How many teeth can "African wild dogs" have?

I found conflicting information on different websites with a humanima article stating that they have 4 toes and 40 teeth (reference). However, multiple sources state that they have 42 teeth (reference ...
The Last Word's user avatar
2 votes

Did Darwin explain why he believed that domestic dogs descend from several distinct species of ancestor?

It seems that this was based on arguments in 1780 by Pyotr Simon Pallas that most domestic animals had descended from two or more aboriginal species that had since become mixed by interbreeding. Here'...
iayork's user avatar
  • 14.3k
2 votes
Accepted

What advantage do dogs have in clearly disclosing whether they are afraid or unafraid in a conflict?

It is better for animals to broadcast their qualities, and size one-another up before risking injury in conflict. As pack animals, dogs are particularly sensitive to where they are placed in a ...
Karl Kjer's user avatar
  • 7,693
2 votes

Why do these 2 dots frequently occur in dogs' eyebrows? Does it serve/served any advantage?

Dogs are actually not prey animals and are pretty high up on the food chain, so the theory that the eye dots are "decoy eyes" doesn't make a whole lot of sense. Realistically speaking, dogs are pack ...
user32481's user avatar
2 votes

Can any species be bred selectively/engineered to become as diverse looking as dogs?

Not a mammal. But goldfish have also been modified both in shape and colour http://40.media.tumblr.com/ef8838366e4b7a51646b74b5330238e3/tumblr_mi60i8S52c1rmp9qqo1_1280.jpg
JayCkat's user avatar
  • 2,932
2 votes

Do animals' facial expressions have similar meanings to humans'?

I would say no, facial expressions in humans do not generally relate to facial expressions in other animals. Even though there are some cases (as described in the comments an previous answers) that ...
AlexDeLarge's user avatar
  • 2,868
2 votes

Has artificial selection / selective breeding ever been targeted at intelligence?

The Wikipedia article on "Selective breeding", which I went to while composing a comment on your question, has this sentence: A Soviet attempt to breed lab rats with higher intelligence led ...
Ben Bolker's user avatar
  • 5,364
2 votes

Why are dogs descendants of Wolves but humans are not descendants of chimpanzees?

The original poster is correct in being concerned about the apparent contradiction in principle between the two statements. That is because one of them is incorrect — or at least misleading. The ...
David's user avatar
  • 26.2k
1 vote
Accepted

Did the jackal (wild African dog) evolve independently or with some form of human domestication?

This answer is just for African golden jackal evolution, but this website (sciencemag.org) explains that... “...researchers compared genomewide DNA samples from jackals, gray wolves, and dogs. They ...
DanPar's user avatar
  • 317
1 vote

Can a dog run 150 km non-stop?

There are 100, 200 and 1000 mile races for huskies, we can check the speeds of the winners of the races: http://www.eaglecapextreme.com/index.php/the-race/race-times 97 miles run in 17.23 hours, ...
bandybabboon's user avatar
  • 10.4k
1 vote

Nature versus nurture regarding aggression in specific dog breeds

There is another study, in addition to that cited by @TumbiSapichu, that establishes a genetic component in canine aggression. This is: Zapata et al. (2016) BMC Genomics 17:572 and is entitled Genetic ...
David's user avatar
  • 26.2k
1 vote

Nature versus nurture regarding aggression in specific dog breeds

It seems that there are some important differences in dog aggression depending on the dog breed (towards strangers, owners, and other dogs): That being said, it seems that a significant proportion of ...
TumbiSapichu's user avatar
1 vote

Do animals' facial expressions have similar meanings to humans'?

Get to know dogs' facial expressions and you will find that there are comparable facial expressions of a canine with that of humans.
Karan Sharma's user avatar
1 vote

Do animals' facial expressions have similar meanings to humans'?

Our cousins in the primate world share the same base facial expressions as we do, happy, sad, disgust, etc; it would make sense that other mammals are capable of facially displaying emotional ...
Fluidity's user avatar
  • 127
1 vote

Do pet animals and humans perceive good and bad smells differently

TL; DR Mostly no. On a molecular basis, cats' and dogs' noses look quite similar to ours. Most of what we know about smell comes from studies on non-human mammals, and is supposed to apply to humans ...
nvja's user avatar
  • 1,150

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