The series ended on June 15, 2005, after a total of four seasons and 66 aired episodes over seven years, plus two produced episodes never aired. It was produced by Nickelodeon Animation Studio and Peter Hannan Productions, and was released on DVD in Region 1 by Shout! Factory.
In 2010, Nickelodeon contracted Amazon.com's CreateSpace service arm to produce DVD sets of CatDog and other Nickelodeon shows exclusively for sale on Amazon. The DVDs were "manufactured-on-demand" DVD-Rs to match orders. The series is also available for download on Amazon's InstantVideo service. From 2011 to 2013, Shout! Factory released the series on DVD via several season sets, and a proper complete series set was released on December 9, 2014.
The rigorous testing of concepts from inception means the network nurtures and refines ideas that may result in only one or two new series per season. By the same token, show creators can feel that they can try anything--and test groups reward some odd ideas.
The most significant factor affecting cat and dog allergen levels in the house dust seems to be the presence of a pet in the house.9 In our study, room temperature, relative humidity, and seasons of the year have not been associated with pet allergen levels. Some studies suggest a potential influence of the periodical growth and loss of fur on the level of animal allergens in houses.9,24 The concentrations of cat and dog allergens in urban, but not rural, houses with an animal were higher than in case of children not having neither a cat nor a dog.25,26 This discrepancy between rural and urban houses could be explained by different habits of keeping these animals: in the country, animals are kept mostly outdoors, whereas the opposite situation was observed in the city. The fact that detectable levels of cat and dog allergens were found in both rural and urban houses without animals can be explained by an easy transmission of these allergens on clothes or other objects. Such way of transferring Can f1 and Fel d1 allergens is probably responsible for the presence of pet allergens in public transportation, cinemas, hotels, schools, and public institutions.27,28 781b155fdc