Chocolate should never be given to dogs as it is highly toxic for them, it can even be fatal. Dogs are unable to metabolise a chemical present in cocoa beans. This chemical is known as theobromine and although humans can metabolise this chemical easily it is a much slower process for dogs. Theobromine causes a toxic reaction at doses as low as 100mg per kg of dog’s weight.
Dark chocolate contains more of this chemical than lighter chocolate so should never be given to dogs. In low doses it can cause vomiting and diarrhoea whilst larger doses can cause severe reactions such as raised blood pressure, respiratory failure and cardiovascular problems which can be fatal. As your dog is unable to metabolise theobromine efficiently it means that high levels of it remain in the bloodstream.
When a cat purrs -it is usually communicating contentment. But strangely enough, cats can also purr when they are stressed or in pain. Owners are usually able to tell the difference between the types of purrs.
A cat’s purr is caused by the laryngeal muscles and the larynx. The purr is in essence vibrations and researchers believe that purring causes the release of endorphins which can reduce anxiety and pain. Cats are able to purr throughout the respiratory cycle, the purr continues through both inhalation and exhalation.
Research has also shown that a purring content cat can also provide its owner with beneficial effects, for instance a purring cat can cause blood pressure to lower and help a human become more relaxed, which is an excellent reason to give your cats more cuddles! When cats are born they are deaf and blind, the vibrations caused by the mother cat purring help to navigate the kitten towards its mother. It has been proposed that as purring is quieter that meowing it protects the kittens from predators which may be alerted by high pitched sounds.
If your cat starts to make unusual noises whilst purring you may need to take him to the vets, unusual sounds whilst purring such as wheezing or a growling sound may signify damage to the larynx either due to disease or trauma.