They are part of the body's defense system. Not only do they fight both viral and bacterial infections, they also are a very important part of the immune system in that they manufacture antibodies that prevent infections as well. Copy & paste the below web address into your browser to see where they are: http://www5.Google.com/imgres?imgurl=http://www.acm.uiuc.edu/sigbio/project/updated-lymphatic/node_p2.gif&imgrefurl=http://www.acm.uiuc.edu/sigbio/project/updated-lymphatic/lymph3.html&h=126&w=105&sz=65&tbnid=fRYjPPWYujgJ:&tbnh=126&tbnw=105&prev=/images%3Fq%3DLymph%2Bnodes&sa=X&oi=image_result&resnum=1&ct=image&cd=1
Yes, dogs have lymph nodes--as do all, mammals. I'm not absolutely sure that most animals (reptiles and fish included), don't all have lymph nodes, but your question was about dogs. Being that the lymph nodes are necessary, as part of the infection fighting system of a mammal. Blood gets filtered through the lymph node, and some of the infectious stuff gets destroyed. Check out this page: http://www.peteducation.com/dict_alpha_listing.cfm?cls=0#L Scroll down to Lymph Node, and see the definition. Also, just as in humans, dogs can get cancer of the lymph node. I have no idea how common the disease is in dogs, you would need further research. For a site which discusses lymph nodes problems and dogs, see this site: http://www.vetinfo4dogs.com/dlymph.html
there are some on the neck
Dogs have lymph nodes throughout their body, many of which are not able to be seen or felt from the surface. Some of the commonly assessed lymph nodes include the prescapular (in front of the shoulder), inguinal (in the flank folds) and popliteal (behind the knee). However, there are lymph nodes along the intestines, between the lungs, along the inside of the backbone, etc.
tiny vessels
lymph-nodes
Lymph nodes
spleen, tonsils, lymph nodes, heart, thymus,
Lymph Nodes
Anterior and posterior cervical lymph nodes.
Yes there are, they are the submandibular lymph nodes
Yes, pigs have lymph nodes.
I just came from the vet scheduled because of my dogs swollen lymph nodes. The vet believes it to be either an infection or lymphoma (cancer). Make an appointment with your vet. They will most likely prescribe antibotics to eliminate any infections. If after antibiotics if the lymph nodes are still swollen they will perform a biopsy. Best wishes.
inguinal
Some symptoms of problems with the spleen and lymph nodes are itching, fever, chills, and swollen lymph nodes.