And "-e" plurals are relatively common as well. e.g., der Hund - die Hunde, der Schuh - die Schuhe. Some "-e" plurals also take a vowel shift, e.g., die Hand - die Hände.
Whilst it might seem a little archaic to say hound instead of dog it hasn't fallen entirely out of fashion here in the UK. The term hound particularly applies to dogs used for hunting, tracking and racing. Referring to one's pet as a hound does however give it an air of gothic menace and so one occasionally hears the term used ironically by owners of small fluffy dogs.
In German, plural words have many types of endings. This link has some examples: http://german.about.com/od/grammar/a/pluralnouns.htm
There are an array of endings, and changes for plurals. Some add -e. Some add -en. Some add -s. Some change the vowel to an umlauted vowel, with or without ending changes. Some nouns don't change at all.
Write them down and study. Make flashcards of them and have a friend quiz you. One note is that all plurals are 'die'.
If you're on computer, there are buttons below all text boxes requiring you to type German letting you do all the special characters.
If you're on mobile, you can usually hold the button for the letter without the umlaut, and the alternative for the letter with umlaut will usually pop up.