They had cattle, but much smaller then the domesticated kinds we know of today. Dogs are the oldest pets but cats were not there yet in these days in this area, not until the Romans came. The domestic animals they had were goat, sheep, pig, chicken, oxen as well as cows. The latter were not that far bred as our modern Frisian pedigree cattle. But the cattle was very useful, for milk, sometimes for meat, skin and bones, but as well for labour. Probably, the animals were kept in the stable all year through, which made them more tame. Besides, the farmer knew the small meadows were used more economically if the food was harvested by himself. Cattle does not eat grass another one has tread upon. Chickens were first introduced to Middle Europe in de 7th and 6th century BC through intensive trading contacts with Italy but were still quite rare. First from 0 AD, chickens were being kept at larger scale.
N. Benecke, 1994: Der Mensch und seine Haustiere, Stuttgart.