A paroxysm is a sudden uncontrollable attack and in people is often applied to events like a 'fit of giggles'. In animals a paroxystic attack is more serious and describes a disorder that starts suddenly but also resolves quickly. A one-off event like this may be nothing to worry about but if the experience is repeated you should contact your vet immediately for advice. Attacks may occur at home or at exercise and the most important concern initially is to make sure your pet cannot hurt themselves during the attack. There are many causes of these attacks and your vet will need to investigate further in order to find out what is causing the attacks so that appropriate treatment can be given if any exist for this type of attack.