Dogs have moods, too, and sometimes, those tail wags take a little vacation. Maybe your pup’s been moping around like a furry couch potato or turning up its nose at treats that used to disappear in ...

Dogs wag their tails for a number of reasons, not just because they're happy. If your dog has a stiff tail with only the tip moving, it can signal aggressiveness or unrest. If your dog puts their ...

Planarian flatworms regenerate their heads and tails after amputation. It turns out that they use Wnt–β-catenin signalling to determine where the head and the tail should form. Figure 1 ...